 This Product
Stio Basis PeakWool Midweight Half Zip | |||||
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| Awards |  Best Overall Base Layer |  Best Value for the Long-Haul | | Best Value Merino Top | |
| Price | $159 List | $130 List Check REI (on sale!) | $70 List Check Price at REI | $39 List Check Price at Amazon | $50 List Check Price at Amazon |
Overall Score  |
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| Star Rating | |||||
| Bottom Line | Grab this base layer if you prefer a heavier fabric that can be used standalone as a top layer | If ultimate warmth over everything else is what you seek in a base layer, look no further | Reach for this base layer when the temperature drops to wear underneath your jacket | Grab this base layer if you're looking for a top made of a soft polyester that still performs | An excellent lightweight, tight-fitting 100% merino base layer for summertime duties |
| Rating Categories | Stio Basis PeakWool... | Smartwool Classic Th... | REI Co-op Midweight... | Carhartt Force Midwe... | Merino.tech Crew |
| Warmth (25%) | |||||
| Breathability (20%) | |||||
| Comfort and Fit (20%) | |||||
| Durability (15%) | |||||
| Drying Speed (10%) | |||||
| Layering Ability (10%) | |||||
| Specifications | Stio Basis PeakWool... | Smartwool Classic Th... | REI Co-op Midweight... | Carhartt Force Midwe... | Merino.tech Crew |
| Fabric Weight Class | Heavyweight | Midweight | Midweight | Midweight | Lightweight |
| Material | 56% Merino Wool, 23% TENCEL™, 12% Recycled Nylon, 7% Nylon, 2% Spandex | 100% Merino wool | 92% recycled polyester, 8% spandex | 100% polyester | 100% Merino wool |
| Fit | Loose | Semi-fitted | Semi-fitted | Loose | Semi-fitted |
| Dryer Safe | Yes, tumble dry low | Yes | Yes, tumble dry low | Yes, tumble dry medium | Yes, tumble dry low; recommended lay flat to dry |
| Available Cuts | Crew, Half-Zip, Hoodie | Crew, 1/4 zip, hoodie | Crew, 1/2 zip | Crew | Crew, v-neck |
| Odor Control Fabric | Naturally odor resistant | Naturally odor resistant | None | Anti-odor treatment | Naturally odor resistant |
| Thumb Loops | Yes | No | Yes | Yes | No |
| Time to Air Dry | 65 min | 70 min | 55 min | 46 min | 55 min |
| UPF Sun Protection | None listed | None listed | 50 | None listed | 25 |
| Seam Stitching | Flatlock seams | Flatlock seams | Flatlock seams | Flatlock seams | Overlock seams |
| Shoulder Top Seams | No | Yes | No | No | Yes |
| Drop Tail Hem | No | No | No | Yes | Yes |
| Measured Weight (Size Large) | 13.1 oz | 11.3 oz | 10.0 oz | 9.3 oz | 6.8 oz |
| Measured Shirt Length (Size Large) | 26.0 in | 28.0 in | 29.0 in | 28.5 in | 29.0 in |
A super comfortable and thick wool/synthetic blend fabric defines the Stio Basis PeakWool Midweight Half Zip, destined to keep the wearer warm despite cold weather. A high collar and thumb loops help to seal in heat, while the half-length zipper helps quickly dump out surplus heat. Quality is obvious anywhere you look on the PeakWool, from the flatlock seams used throughout to the comfortable panel shoulder design.
The varied synthetic/wool blend (56% Merino Wool, 23% Tencel, 12% Recycled Nylon, 7% Nylon, 2% Spandex) of the Stio Basis PeakWool Midweight Half Zip fabric is spun up to a heavy 280 g/ms weight, making it extremely comfortable to wear. The fabric blend that includes nylon for strength and a little elastane for stretch should keep its shape better than a 100% merino top throughout its life.
We enjoyed many of the details found throughout that enhance its comfort, like the burly half-zipper, which helps thermoregulate, and the high collar and thumb loops at the cuffs, which help lock in heat.
Layering ability is also top-notch. Piling additional layers on top is a sure way to craft a great winter layer system for cold weather, and the PeakWool Midweight is reasonably durable enough to be worn all by itself, with a look refined and finished enough to be appropriate for casual public outings.
Like many other heavier base layers, the dry time on the line for the Stio Basis PeakWool Midweight Half Zip isn't great; this top took longer than most to fully dry. Heavier fabric and its tight weave absorb more moisture, which then takes longer to naturally evaporate.
This also usually suggests that if you do get sweaty while wearing the PeakWool Midweight, it'll also take a while to get dry, and a wet base layer is just colder and more clammy than a drier one.
And despite its heavier weight, our workout tests didn't indicate that the Stio Basis PeakWool Midweight Half Zip punched above its weight class when it comes to warmth, only being slightly above average when compared to our entire lineup. What you do get for the weight is, instead, seemingly endless comfort and durability.
Coming in at 13.1 ounces for a size “large”, the Stio Basis could very well be too much base layer for some applications once the mercury starts to rise. Keep this base layer close at hand when the flakes start to fly, and the ropes for the new groomers start to drop.
Heavier base layers are undoubtedly warm and comfy, and the Stio Basis PeakWool Midweight Half Zip is no exception. The PeakWool works best as a base layer in cold, wintry conditions. We would suggest it over a 100% merino base layer of a similar weight if you're worried about durability in the long run. This is a top-tier base layer with exceptional stitchwork and quality, ready to support you during cold-weather adventures on the tops of mountains or right next to the lodge's fireplace with your favorite book.
