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We took 42 base layers from Arc'teryx, Ridge Merino, Smartwool, Black Diamond, Icebreaker, Patagonia, and others to extremes during months of real-world testing to uncover the top performers for varied needs.
Base layers fabrics vary greatly in thickness, therefore, we recommend selecting the best fabric weight for your specific needs. Our testing team found that midweight options provide the widest range of performance for year round use.
Credit: Trish Matheny
By Trish Matheny ⋅ Review Editor ⋅ Updated April 1, 2026
Your layering system starts from the ground up, and there's no understating the value of a good base. A well-designed base layer is your trusted companion in the deep chill of winter, keeping you toasty warm, without adding bulk. A great one can be worn even once spring hits, offering thermoregulation when outdoor pursuits take you to higher altitudes.
Over the last decade, we have purchased and evaluated hundreds of base layers for men and women, wearing them on climbing trips in Yosemite Valley and up to the highest alpine peaks in the lower 48.
Earning a spot at the top of our list for men is the Smartwool Classic Thermal Merino 1/4 Zip. It offers a soft, cozy fit straight off the shelf, along with superior warmth and breathability. For women, the Icebreaker Merino 200 Oasis Crewe is the best for everyday wear. This simple yet effective crew top delivers on warmth and is easy to layer under other jackets and sweaters.
The right layering kit will not only make or break a day in the backcountry but may also become a favorite cozy outfit for lazy days by the fireplace or for walking the dog in the early mornings. To complete your set, check out long underwear bottoms, soft fleece jackets, and even warm socks to help keep you toasty all season long.
Who this is best for: The Smartwool Classic Thermal Merino 1/4 Zip is a perfect pick for anyone gearing up for colder conditions; whether you're heading out for a winter backpacking trip, hitting the ski slopes, or just need a reliable and cozy base layer for daily use during the cold season. If you value warmth, breathability, and a soft, snug feel, and in these metrics, this midweight layer delivers. It's a solid choice for outdoor adventurers who prefer natural fibers and want something that holds up well under light aerobic activity.
Why we love it: Smartwool has delivered big on comfort and performance here. The 100% Merino construction wicks moisture naturally, stays warm even when wet, and resists odors, all without feeling bulky. We love the cozy fit and thoughtful features. Strategically placed seams prevent backpack chafing, and the quarter zip allows for easy heat dumping. One of our team members put it best: “The Smartwool offers just the right balance — it's a top I grab not only because it's comfortable, but because I know it'll do the job right every time. Whether I'm sweating on a snowy trail or just hanging by the fire, I never regret packing this layer.”
Should you buy it? It may be overkill for warm-to-cool temps, but if you're prepping for colder conditions, the Smartwool Classic Thermal is absolutely worth it. Just keep in mind that Merino wool is delicate. It's not ideal for rough or abrasive environments, and it'll need a bit more TLC in the wash. As our lead tester Justin Simoni explains: “Its ultra-fine natural fibers won't stand a chance if it encounters anything abrasive, such as tree limbs or granite rock faces. But if you treat it right, it'll reward you with incredible comfort and performance.”
Who this is best for: The Icebreaker Merino 200 Oasis Crewe fits well, feels soft, and manages moisture and odor better than most. If you're already a fan of Merino wool and looking for something ultra-comfy with a flattering slim fit, this one's a top contender. If you need something for year-round use or high-output activities, it might be a bit too warm, but it's great for cold-weather layering and is our top choice for everyday winter wear.
Why we love it: The 100% Merino wool construction of the Oasis Crewe offers an impressively soft skin feel, and the layer features thoughtful design elements like gusseted underarms for better mobility and flatlock seams that boost comfort and durability. “I really loved how it moved with me on long climbs. It never felt restrictive, and the fabric felt great against my skin all day,” one tester shared. The slim cut traps heat effectively while still wicking sweat from the skin, and it's odor-resistant enough to wear multiple days in a row without getting funky. This layer has a high warmth-to-weight ratio, and the crewneck is easier to layer than tops with a hood or zip. We love wearing this under heavier pieces when temps drop.
Should you buy it? If softness, fit, and odor control are top priorities and you're okay with a slower-drying time, the Oasis Crewe is well worth considering, even with the high price tag. But for more active days, you might want something more performance-oriented. “I'm often sweating on climbs and cooling off during the descents, and in the Oasis, the cold of that moisture was noticeable on the way down,” noted one tester. Though it may not be your go-to if fast-drying or breathability are critical, this premium-feeling base layer stands out for its wearable comfort and performance in day-to-day life.
The Icebreaker Merino 200 Oasis Crewe is a high-quality design with a longer torso that's easy to layer while providing excellent thermoregulation during a variety of mountain sports.
Who this is best for: The REI Co-op Midweight Half-Zip is an affordable, no-fuss base layer for general outdoor use. It's a solid pick for budget-conscious adventurers who want reliable comfort and performance for everything from spring hiking to cold-weather lounging close to home. Its 220 g/sm construction offers enough warmth for cool conditions, while remaining breathable and soft on the skin.
Why we love it: This layer balances warmth, flexibility, and thoughtful details. The fabric is stretchy and comfortable without the stiff, plasticky feel that some synthetics can have. “Although more affordable than most, this layer includes key features that I find make it versatile for regular use throughout the year — a win-win on all counts,” says lead tester Justin Simoni. With thumb loops, a half-zip for temperature control, and flatlock seams to reduce shoulder irritation under a pack, it punches above its price point in design and wearability.
Should you buy it? The Midweight Half-Zip doesn't dominate any single performance metric, and its synthetic makeup lacks the natural warmth and odor resistance of Merino wool. Its stretchy fabric, while comfortable, can make layering a bit more cumbersome. That said, it's hard to beat in terms of value. If you're looking for a dependable base layer without spending a fortune—and don't mind giving up a few premium features, this one is an easy “yes.”
Small details such as discreet thumb loops featured in the REI Co-op Midweight Half-Zip design help to keep your hands covered and warm, while aiding in easy layering over top. Credit: Justin Simoni
Who this is best for: The REI Co-op Midweight Base Layer Crew - Women's is a great option for women who want a flattering, functional, and durable synthetic layer without spending a fortune on the latest design. It's ideal for low-output adventures like hiking or climbing on cool days, especially when comfort and mobility are more important than top-tier breathability.
Why we love it: This base layer combines a close body fit with soft, stretchy fabric and solid construction. After putting it through its paces in Indian Creek, one tester shared, “The climbing here is physical and the routes are long and demanding, yet this layer held its own, and I especially liked the flatlock seams — they prevented discomfort even when I was contorted into awkward positions.” Thoughtful details like thumb loops and reinforced stitching make it both comfortable and dependable, even in demanding conditions.
Should you buy it? The Midweight Base Layer Crew does come with some trade-offs. Like many synthetic layers I've used, it retains odor quickly, and unfortunately, it started to smell almost immediately after use. It doesn't dry as fast as more breathable materials like merino wool, and the tightly woven polyester also limits airflow, making it less ideal for high-output activities. But if you're looking for a solid, well-priced option that's durable and fits well, this piece is hard to beat for the money.
Who this is best for: The Merino.tech Crew is a good compromise for budget-conscious shoppers who still want the temperature-regulating and moisture-wicking benefits of 100% Merino wool. It's especially appealing for those who prioritize breathability on chilly runs or need a light layer for sleeping in cold bivy conditions. If you're after the performance you get from natural fiber, minus the high price tag, this one stands out.
Why we love it: This lightweight crew uses ultra-fine Merino microfibers that feel soft against the skin without any of the infamous “itch” associated with traditional wool. It layers easily thanks to its close-to-body fit and has excellent thermoregulation, as is standard in most merino wool clothing. “A lighter fabric weight like the Merino.tech Crew is usually what I prefer on my chillier runs since I tend to build up a lot of heat, but still need some insulation,” says lead reviewer Justin Simoni.
Should you buy it? The Merino.tech Crew delivers excellent value, but it's not without some flaws. The 100% wool construction is a bit delicate and lacks reinforcement, so it's less durable than blended or synthetic options. Overlock seams (rather than flatlock) may also irritate sensitive skin, especially when worn under other layers or backpack straps. The slim fit could limit movement for some, so if you're worried about mobility, you might want to size up. Despite these caveats, if you're willing to care for it gently and prioritize comfort and breathability over long-term ruggedness, this is a standout pick in the entry-level Merino category.
Excellent slim fit is flattering and easy to layer
Thoughtfully placed seams for noticeable comfort
Super thin and breathable
Quick drying
REASONS TO AVOID
Fabric is susceptible to durability issues
Lacks stand-alone warmth for year-round use
Who this is best for: The Smartwool Classic All-Season Merino is a budget wool baselayer perfect for those who want a light, breathable, and odor-resistant top that works well across seasons. Its thin construction and high breathability make it especially well-suited for active users—skiers, hikers, and runners—seeking a high-performance layer that fits easily under additional mid-layers or outerwear without adding bulk. Although super thin and lightweight, the design includes a nylon spun core for increased durability as well as maintaining the shape of the primarily Merino wool construction.
Why we love it: This top combines 88% Merino wool with 12% nylon for a balance of performance and durability. It's super thin and breathable, quick-drying, and the slim cut layers well while still being flattering. “This is my go-to layer that layers easily below my ski bibs during spring laps on my favorite backcountry line,” said one tester. Merrow stitching and flatlock seams, plus a raglan sleeve design, keep it comfortable under a pack, and the longer hem adds coverage around the hips. Although we wish it had thumb loops for additional warmth and sun protection for the hands, this crew for perfect for those seeking a budget-friendly lightweight wool design.
Should you buy it? If you're looking for a lightweight layer that wicks well, dries quickly, and resists odor through long days of activity, the All-Season Merino won't disappoint. Just keep in mind that it's not built for stand-alone warmth in harsh winter conditions, and its ultra-thin fabric may be more susceptible to wear over time. However, the ultra-thin material makes it perfect if you plan to earn your turns or train during the cold months. For year-round layering and breathable comfort, though, it's a smart pick.
The Smartwool Classic All-Season Merino is a low-profile base layer that features a Merino and nylon-blended construction that's perfect for cooler weather.
Unique knitting tech that optimizing areas for different attributes
Lofty wool/synthetic blends boosts breathability
Long length and drop tail
REASONS TO AVOID
Seams exist in some less-than-ideal places
More expensive than simpler options
Who this is best for: The Smartwool Intraknit Thermal Merino is what we grab for when the temps are low, we need the added warmth of a heavier base layer, and we're also planning on some really active pursuits: ski touring, hiking, or mountaineering. This base layer keeps you warm as well as dry, with impressive breathability for the weight of the fabric, beating out other 100% merino wool tops, care of the synthetic fibers added to the fabric's recipe. The slimmer fit hugs our frame well, better wicking of sweat off our bodies, keeping us comfy and dry. It's also durable enough to wear on its own if temps unexpectedly rise.
Why we love it: The very unique knitting tech found on the Smartwool Intraknit Thermal Merino delivers separate zones which are optimized to give you different performance where you want it. For example, the tops of the shoulders, arm pits, and the back have more ventilation, while the elbows are more abrasion-resistant. The sleeve ends and sides are even stretchier than the rest of this top, enhancing comfort even further.
Should you buy it? Like many products that rely on technical advances, the price is higher than some other choices, and you may have to ask yourself if it's delivering enough value for it to be worth it. In the case of the Intraknit, we think the added durability will likely translate into a longer usable life in your closet. We also weren't entirely impressed with some of the patterning, which put seams in places that may rub or chafe. “Two seams converge right at the armpit, which is a pet peeve of mine. The seam line runs the crest of the shoulders as well, which may get annoying if you carry a heavy pack”, notes our tester.
Air-permeable construction for maximum breathability
Flattering fit
Zippered neck and hood to contain or release body heat
Discreet thumb loops for additional coverage and layering
REASONS TO AVOID
Expensive
Not a good choice for standalone warmth
Who this is best for: A new favorite in the lineup this year is the Stio Trax Power Grid Half Zip Hoodie. It features a unique Power Grid fleece material that creates a lofted grid pattern with mesh in between each square of fleece. This design releases moisture faster than any other base we've worn, and is perfect for women who go hard in the mountains and need the moisture-management benefits that synthetics offer without sacrificing comfort. This layer quickly became our go-to for trail runs, rock climbing, backcountry skiing, and spring hikes. While warm enough to be a stand-alone layer for low-output winter activities like riding the chairlift or walking the dog, it is perfect for more active pursuits. It even provides solid wicking performance when layered beneath larger jackets and midlayers.
Why we love it: The grid design of the Stio Trax is by far its standout feature, but this top has features that help with temp and moisture regulation even further. The roomy hood, 1/4-zip neck, and discreet thumb loops allow you to further trap or offload body heat depending on the conditions and temperatures. And while looks aren't everything, our testers appreciated the flattering fit and would reach for this layer whether they were trail running, rock climbing, or mountain biking. A small zippered pocket that was perfect for a car key, energy gel, or credit card, depending on our day.
Should you buy it? Despite being our go-to layer for active days, the Trax Power Grid isn't without a few caveats. “The lightweight and air-permeable construction would really disappoint someone looking for standalone warmth for the ski resort or getting the dog out for a walk in the winter,” says one tester. That said, it was perfect for activities where we started to work up a sweat, like stacking wood and chopping kindling. And even after a long testing period, we couldn't find any signs of wear and tear. Also, synthetic fabrics are notorious for holding onto odor, but the Trax has an anti-odor finish that has worked well so far, and we are hopeful that it continues to perform over time. Ultimately, for anyone who prioritizes active performance and breathability, the Trax Power Grid is tough to beat.
The Stio Trax Power Grid Half Zip Hoodie is the perfect layer for women whose activities require ample breathability to keep them warm and cozy outdoors. Credit: Trish Matheny
Who this is best for: The Ibex Woolies Pro Tech Crew is perfect for those looking for a very lightweight base layer top for three-season use. It is our go-to when we want to add a little warmth to our layering system and when absolutely excellent breathability is a total non-negotiable. The extremely lightweight 125 g/sm wool/synthetic NuYarn blend fits snugly over the body, allowing sweat to move through easily, keeping you as dry as possible. “Even as a bigger guy, I love the athletic fit of the Ibex Woolies Pro Tech Crew. This top feels as good alone as it does layered,” beams our tester.
Why we love it: We adore just how stretchy the fabric found on the Ibex Woolies Pro Tech Crew really is, hugging our body and moving along with it, rather than fighting against it, or restricting our movement. It layers up effortlessly and complements anything we wear on top. The lightweight fabric dries super fast on the line, hinting at how fast it'll dry when wearing, as well as for times we stop for the night while backpacking or in the hotel room to hang it up after a quick wash for next morning's duties.
Should you buy it? This is a perfect top for warmer weather, but if you're looking for something specifically for the coldest conditions imaginable, it's just not heavy enough. Additionally, such a high-performance, lightweight base layer needs a little extra TLC, so make sure you're OK with mostly handwashing the Ibex Woolies Pro Tech Crew and hanging it up to dry to protect your investment. Being partly made of wool, you'll want to think about using this top under a more protective layer most of the time, as it'll be damaged if it comes into contact with abrasive surfaces.
The Ibex Woolies Pro Tech Crew is sensational lightweight, but delivers on both warmth and comfort, care of its advanced wool/synthetic blended fabric. Credit: Justin Simoni
Who this is best for: The Arc'teryx Rho Hoody is a durable synthetic base layer that provides reliable performance. It has a close-fitting cut, and a soft and cozy fleece interior. Articulated patterning and gusseted underarms allow for a full range of motion, a detail that runners and Nordic skiers may appreciate, while the slim fit helps the layer harness body heat and reduce airflow through the synthetic fibers. If you have long, thick, and curly hair like our lead tester, you'll appreciate the unique opening in the hood for your ponytail. Although we think it looks a little silly, it sure cuts down the wind. This layer has been in our lineup for close to 4 years, and each time we retest it, we are reminded of how much we love it.
Why we love it: The Rho Hoody was made to move in. The slim fit, articulated patterning, thoughtful seams, and versatile warmth will perfectly complement the rest of your winter kit, especially for women who need their gear to keep up with challenging objectives. A high neckline and a balaclava-style hood make it an ideal layering piece, as well as providing decent standalone warmth and sun protection in the alpine. While we wish it had thumb loops for additional coverage and easier layering, the slim fit does a good job of holding the top in place when pulling a jacket over top of the smooth exterior fabric. “After several rounds of testing over the years, I can confidently attest to its durability and lasting performance,” says one tester after noting the Rho's ability to maintain performance after many years of use.
Should you buy it? The Rho Hoody is for women seeking a base layer that they can wear for backcountry touring, early spring climbs, and late fall trail runs. The design is made with intention, and will last you for years, which can help justify the high cost. However, it might not be right for everyone. The thicker fabric and high neckline provide additional warmth, but they limit breathability during fast-paced activities. And even though the Rho is treated with an anti-odor Polygiene treatment (which seemed to perform better this year than in previous testing periods), it still holds onto body odor, especially when worn for multiple days without washing. Lead tester Trish sums it up: “The Rho is perfect on its own during crisp days in the spring and fall, or even summer mornings high in the mountains, when you need something cozy to start your day.”
The Arc'teryx Rho Hoody is our overall favorite when it comes to a high quality and top-performing women's base layer who's durable design is built to perform throughout the seasons. Credit: Trish Matheny
Why Trust GearLab
Our GearLab testing team consists of outdoor enthusiasts from various backgrounds and geographical locations who know a high-performing base layer when they see one or when they wear one.
Justin Simoni: As lead reviewer for our Men's Base Layer lineup, and a Colorado local, Justin takes advantage of his prime location to make year-round ascents of Longs Peak, and often relies on human-powered bike-from-town approaches. For the last ten years, he has poured his energy into long-distance bikepacking races and pursuing mountain FKTs (Fastest Known Times), including the Tour Divide, Colorado Trail Race, and even his own personal 14er challenges. If Justin knows anything about anything, it's that base layers are critical to moving comfortably through remote locations, especially when awaiting the heat of the rising sun.
Trish Matheny: Spending over a decade living and exploring the Teton Mountain Range has prepped Trish to lead our Women's baselayer testing team. Whether prioritizing backcountry miles on her splitboard, trail running throughout the High Sierra backcountry, climbing multi-pitch routes high in the alpine, or simply trying to stay warm in camp four, she has extensive experience-based knowledge in selecting the best layer for her chosen activity. After relocating to California and joining Yosemite's Search and Rescue Team, she spends the majority of her time living outdoors, and of course, she's wearing the best base layer for the conditions.
Trish and Justin put these layers to the test, whether training indoors or playing in the mountains. They hope their hard-earned expertise will help you with your next purchase.
How We Tested
GearLab's testing teams have thoughtfully selected and purchased hundreds of men's and women's base layers over the last 10 years. Our expert team really puts these layers to the test, whether pursuing various outdoor objectives or simply lounging around at the house to better determine overall comfort and fit. To ensure we remain unbiased during side-by-side testing, we never accept any freebie products from manufacturers.
Our testing team spends many hours out in the field capturing subjective insights across all key metrics for each base layer and brings them back to the “lab” for more objective assessments. We layer them, wear them as standalone pieces, sweat in them, wash them, sweat in them again… you get the picture. Our testing for women's base layers and our process for testing men's base layers cover the same basic metrics, with a few differentiating fit-related points between genders. Fieldwork can involve anything from 3,000-foot multi-pitch climbs to winter days in the backcountry, and high-alpine trail runs in the California Sierra Nevada range and in the Cordillera Blanca in Peru.
The base layers in this review were tested across 6 performance metrics:
Warmth
Breathability
Comfort and Fit
Durability
Drying Speed
Layering Ability
We measured everything from overall warmth and breathability to drying speed to carefully evaluate the individual performance of each layer.
How to Choose a Base Layer
Base layers must wick sweat and moisture away from the body while maintaining body heat and providing a cozy next-to-skin feel. Many modern designs even feature gussets in specific locations to maximize mobility during various outdoor activities. Some are the perfect base for layering with mid-weight and heavier-weight jackets, while others offer enough stand-alone performance to be worn independently.
Baselayers are for more than just skiing. Find the right one, and it can become like a second skin for year-round use. Credit: Justin Simoni
Men's Base Layers
After extensive testing and taking in-depth notes on each men's base layer, we rate and rank each one. The chart below summarizes the performance of each layer we reviewed during our hunt for the best men's thermal layers available today.
Women's Base Layers
GearLab's expert female testing team pulled out all the stops to examine the top base layers for women, putting each garment through a range of tests to evaluate overall and comparative performance, as shown in the chart below.
Natural vs Synthetic Fibers
These days, base layers are typically constructed from natural fibers (Merino wool, bamboo, Tencel, and hemp), synthetics (nylon, spandex, polyester), or a combination of the two. Merino wool is deservedly the most sought-after fabric for base layers due to its ability to maintain warmth even when wet and its naturally wicking antimicrobial fibers that help move sweat and resist odor. Perhaps most importantly, it ages well and becomes remarkably soft against the skin the longer you wear it. These superpowers do not come without a few trade-offs. Namely, reduced durability due to the delicate natures of the fibers, a slow drying speed, and, most notably, steep price tags.
Although more expensive and less durable, Merino wool offers naturally odor-free wicking performance and next-to-skin comfort.
By comparison, synthetics are known for their lasting durability. Recycled polyester, tencel, nylon, spandex, and elastane combine to offer superior stretch, forming to your shape and enhancing mobility. They also allow for a more breathable, faster-drying design. The major drawback most people associate with synthetics is their tendency to hold onto body odor - Capilene, anyone? However, these fabrics are often more affordable and last longer than their Merino wool counterparts.
Synthetics are known for a less expensive price tag and a highly durable construction, even if they may also hold onto body odor after extensive use.
Are you looking for the best of both worlds? Consider a wool-synthetic blend. This hybrid blends the warmth and softness of Merino wool with stronger synthetic fibers, enhancing the garment's overall durability and its ability to maintain its shape between washes.
Merino wool and synthetic blends combine the best of all worlds, offering high performance without losing shape or holding onto body odor after multiple uses between washes.
What Is The Difference Between Fabric Weights?
While fabric weights range from ultralight to expedition weight, I'll focus on the three most commonly used fabric options: light, mid, and heavy. Lightweight base layers are designed for warm weather. Think of sleeping in the desert during the summer when daytime layering isn't necessary, but nights spent under the stars bring colder temperatures. When worn against the skin as the first step of your cold-weather kit, lightweight layers can also be a great choice for high-output winter activities. Midweight layers are perhaps the most versatile options out there. These are perfect stand-alone layers for spring and fall, and they still work well as the base of your kit for resort and backcountry turns in the winter. Heavyweight layers are for those seeking a high degree of warmth above all else. These thicker tops can be difficult to layer and less versatile across seasons and activities. However, if expedition skiing or exploration features in your calendar during the coldest months of the year, it may warrant a thicker garment. The choice also depends on your personal physiology; if you know you run warm or cold, you'll want to adjust your fabric weight accordingly.
An example of a layering system. Base layer, fleece mid layer, soft shell, and down puffy. The Patagonia Capilene Air, pictured here, traps heat extremely well in a layering system but as a stand-alone layer, air cuts right thru it. Credit: Roland Mott
Are Fit and Features Important?
I recommend trying on your next base layer to select a top that fits well and sits next to your skin without limiting your range of motion. This helps prevent cold drafts and allows the thermal layer to wick moisture more effectively. As with any clothing purchase, pay attention to the product details, such as fit—regular, trim, or slim—to determine the layer's cut.
Base layers are available in a variety of different cuts; while some may feel too restrictive, oversized layers don't provide the best performance. Credit: Trish Matheny
Base layers can come with all sorts of bells and whistles these days, but they don't have to. There are many feature options, from hoods to thumb loops to longer cuts, zippers, and more, and each serves a different purpose. While our lead women's tester prefers a Merino wool blend with a 1/4 zip, hood, and thumb loops, this could be overkill if you are shopping only for an annual resort skiing trip. Things like hoods, extra zippers, lofted fabrics, and thumb loops provide additional warmth, but they also take up more space in your cold-weather kit.
Some base layer designs are feature-rich, including versatile hoods, zippered pockets, and more.
FAQs
For a base layer to do it's best work keeping you warm and dry, it should have a close, but unrestrictive fit. This allows the fibers to keep warmth close to your skin and helps wick away sweat more efficiently, as the material is better able to transfer moisture outward when it is in direct contact with your skin. A closer fit also feels better when you start piling on the top layers.
No, base layers are meant to be the first thing that goes on in your whole layering kit, as they have . However, some people may choose to wear a tank or tee under their baselayer, just in case the day warms up.
Base layer is pretty self explanitory; the function is in the name. But what do you wear over it? It depends on the season, but you can add anything from a light windbreaker or a loose overshirt, to a thick fleece, or a cozy sweater. Check out our tips on how to build a bulletproof layering system depending on the season and activity of choice.
Most of us have probably had an experience with an unbearably itchy sweater at some point or another. Thankfully, most modern base layers out there use an ultra-soft and fine-woven merino wool that has a delightful skin feel. While a few of the tops we tested had a slight itch to them, they quickly softened up after a few wears and a wash.
Some athletes and backcountry enthusiasts require the highest-performing base layers with the most modern and innovative technologies, but most consumers will find that a more affordable option easily meets their needs. Credit: Trish Matheny
Other Notable Base Layers
We've tested a lot of other base layers, and some we really liked, but unfortunately, we can't include all of them here. If none of the options above piqued your interest, or you're looking for a specific feature or fabric weight, you might want to take a peek at these other base layers.
Ridge Merino Aspect Midweight - This is a midweight, 100% wool layer we love for its high performance at an affordable price. The longer length in the arms and torso provides additional coverage, while the thumb loops create easier layering for a wool design.
Ibex Woolies Pro Tech Crew - Women's - The women's version of the Woolies Pro Tech is a perfect lightweight Merino wool base layer option for less cold weather and a favorite of our women's testing team for wearing under outer layers on days they were planning to work up a sweat. The design features unique, innovative Nuyarn technology that improves the efficiency of wool's performance while enhancing overall durability, and the addition of 15% nylon provides better shape retention than 100% wool options. Although some recommend sizing up, we found the slim-fitting design perfect, especially after a few washes when the fabric softened and stretched just a little. The men's version of this top is a favorite for breathability, but in the women's category, it was beat out by the slightly lighter Stio Trax hoodie for this honor.
Stio Basis PeakWool Midweight Half Zip - This layer is labeled midweight, but features one of the thicker constructions that we've tested, and at 280g/m², it nearly falls into the heavyweight category. It features one of the softest Merino-wool-blended fabrics we've tested, and of all the thicker wool designs, this is our top choice for overall warmth. We tested both the men's and women's version of this top, and both teams said it was one of the coziest options, feeling akin to your favorite hoodie, but with a sportier fit.
Burgeon Alpha Direct 90 Hoodie — When you absolutely need the lightest weight base layer that still packs a ton of warmth, this Alpha Direct top should be at the top of your wish list, especially for summertime duties where both weight and packed volume are at a premium. The lofty, technical fleece locks in warm air, while being incredibly hydrophobic, allowing perspiration to escape to help keep your dry. The lack of face and backing fabric makes it far more delicate than other options, so we only suggest it for living beneath a more durable layer, be it a wind jacket or sun shirt.
Carhartt Base Force Midweight Crew - If some of these base layers seem a little too technical and delicate, this base layer is here to deliver you a no-nonsense top that you can wear alone or underneath another layer, with the durability and comfort of your favorite casual top. The midweight, 100% polyester fabric is comfortable to wear all day with a semi-loose fit. Knowing that this top is comparatively more durable means you can use it alone on outside jobs that may ruin more performant tops. That may be the value for your money you've been seeking. This top makes a great, any day casual choice.
Conclusion
Although there are a ton of options out there, we hope this article helps you choose the best layer for your specific needs and body shape. After months of research, in-field testing, and gathering experience from multiple testers, we aim to provide specific details about the attributes of each layer to inform your decision when making the next purchase. We hope you have as much fun in these layers as we did.
We sure had fun testing these layers and hope our insights and experiences help inform your upcoming purchase. Credit: Justin Simoni
