REASONS TO BUY
Sheet helps spread out quilt over body
Pad sleeve keeps pad and pillow from migrating
900-fill-power duck down
REASONS TO AVOID
Learning curve to the system
Opinionated setup
Not as versatile as other quilts
Zenbivy Ultralight Muscovy 25 Bed Review
Smartly designed for those who don't like to be confined, this comfy summertime quilt pairs with an optional sheet to create a roomy sleep system that still effectively blocks drafts
The Zenbivy Ultralight Muscovy 25 Bed
Credit: Justin Simoni
By Justin Simoni ⋅ Review Editor ⋅ July 2, 2025
RELATED: The Best Ultralight Sleeping Bag
Our Verdict
Zenbivy thinks it's found a solution to sleepless nights. If you feel uncomfortably confined by your bag or quilt when adjusting positions during sleep, the Ultralight Muscovy is designed to provide relief by moving the ends of the quilt away from your sides, creating more space between the quilt and the edges of your sleeping pad. For claustrophobic sleepers, this could be all that's needed to feel less confined and more comfortable while dozing off in the back country. Plus, all this comes in an ultralight package, with minimal added weight compared to a conventional sleeping bag or quilt. See our ultralight sleeping bag review for a comprehensive assessment of the top quilts on the market today and their ultralight mummy bag competition.
Our Analysis and Test Results
For some, the dream is to bring more of the comfort of their own bed into the backcountry. The Zenbivy Ultralight Muscovy 25 with its Ultralight Sheet attempts to deliver you just that. Its “bed” system is, in reality, a souped-up sleeping pad sleeve that you attach to the matching quilt via a series of hooks and loops. This system keeps your sleeping pad and pillow from wandering off in the middle of the night, while also providing top-rate draft protection from the sides, no matter how many times you change positions during the night. The quilt features high-quality 900-fill-power duck down, sewn within baffles made of lightweight 10D PFAS-free DWR fabric.
The Zenbivy fits more like a conventional bedsheet, rather than fitting tightly around your body. The integrated hood also helps to keep your pillow from migrating during the night.
Credit: Justin Simoni
Warmth
When evaluating warmth by the numbers, we consider the weight of the down fill itself, as well as its fill power, to arrive at an educated estimate of the warmth we can expect from a quilt. Then, we see if that guess, alongside our nights out snoozing, and our lab test, all corroborate. Are you getting what the manufacturer is promising? By the numbers, the amount of down fill in the Zenbivy Ultralight closely aligns with its manufacturer's stated limit rating of 35F. We spent a very mild night out in the high 40s and never felt too warm or too cold. Our lab tests placed the quilt between a 30-degree limit-rated bag and a 45-degree limit-rated bag, as predicted by our calculations. All this gives us confidence that the 35°F limit rating is pretty spot on, but don't expect the quilt to perform warmer than that.
The Zenbivy Ultralight Sheet that we tested alongside the Zenbivy Ultralight Muscovy 25 Bed did a good job of keeping drafts to a minimum from the sides and above our heads, but this product doesn't provide any insulation itself.
Even with our best attempts at thwarting the draft protection of the Zenbivy Ultralight Muscovy 25 Bed, the Ultralight Sheet held the quilt fast to our sleeping pad.
Credit: Justin Simoni
We were a little surprised that the design of the bed and quilt favored comfort above almost all else. For example, there is a cinch by the neck to bring it a little closer to the body, but the cinch only narrows down the top center of the quilt, rather than the whole top side. There's also no way to wrap and snap the quilt around your head like you'll find in many other quilts. Both features would contradict the ethos of the system, providing a more “bed-like” experience, but we can imagine really missing these details if temperatures fall farther than expected.
The Ultralight Sheet wraps the quilt around then secures it next to your sleeping pad, while preventing drafts from the sides and top.
Credit: Justin Simoni
Weight
Taken holistically, the Zenbivy Ultralight Muscovy 25 with its ultralight sheet comes to a total of 21.6 ounces. Wrapped up in the slim, 10D Pertex Quantum DWR-free fabric, the quilt features 11.5 ounces of premium fill: 900FP Muscovy Down. This insulation comprises 53% of the total weight of the quilt, which is slightly lower than the percentage we see in other quilts and bags, partly because the bag liner alone weighs 2.9 ounces. You also need less 900 fill power down (by weight) to fill the same volume of baffles when compared to the lower-powered down used in other quilts.
Inspecting the quilt closely, there's little room for critique on how one would remove unneeded weight; all the features that make this quilt great are found in an optimized state. The fabric itself is so thin as to be almost translucent, with down easily visible through it, which we admit looks cool. For trips where you're trying to cut as much weight as possible, the bag liner is optional: the Zenbivy Ultralight will work much like a conventional quilt without it, though, of course, you lose many of the features that make the Zenbivy system stand out.
The bottom of the bed is essentially a pad sleeve, which reveals the bed is basically a back panel that wraps the top of the quilt, preventing even the idea of a draft.
Credit: Justin Simoni
Comfort
The Zenbivy Ultralight Muscovy 25, coupled with its Ultralight Sheet, is built to practically eliminate drafts from the sides, no matter how much you toss and turn through the night. Full stop: if that's your primary challenge when sleeping out in the backcountry, this is a great solution. The Ultralight Sheet works fairly cleverly: it is attached to the sides of the quilt through a series of color-coded hooks. Your sleeping pad is then pushed into the bed sheet's sleeve underneath the quilt itself.
Other than losing valuable heat from side drafts, the Zenbivy Ultralight Sheet also features a hood to help block wind from coming in from above your head. A big and valid critique of quilts in general is that the insulation stops at your neck, requiring you to wear an insulated hat. The UL bed sheet doesn't solve this, but it does provide a roomy shelf for tucking a comfortable layer, such as an insulated jacket, to pad out around your head. “This is my favorite part of the Zenbivy system. At home, I sometimes like sleeping with an extra pillow on top of my head, and the integrated hood lets me roughly emulate that,” shared our lead tester.
Zenbivy specs a “Large” Size for sleepers 5'8" to 6'2", which gave our 5'11" tester a generous amount of space to snooze.
Credit: Justin Simoni
All this provides a more “bed-like” experience, akin to a blanket lying on top of your body rather than wrapped around it. This is great news for those who feel claustrophobic in a sleeping bag or a conventional quilt system and who are looking for an ultralight solution to this problem. Lead tester Justin Simoni commented, “It took some getting used to as I naturally like curling up into a ball when sleeping. But I can see the appeal.”
Versatility
Quilts, in general, usually demonstrate a greater amount of versatility than sleeping bags. Along with the opportunity for weight savings over a bag, those are the two big reasons you'd generally prefer them. But with the Zenbivy Ultralight Muscovy 25 and its Ultralight Sheet, you're sort of locked into the system as the quilt lacks many of the features that allow you to use it over a wide range of temperatures. There's no real way to put it in full blanket mode, nor is there a way to cinch it up tight into a hoodless sleeping bag, as the quilt lacks those specific features, incorporating its own hook-and-loop system to attach its Ultralight Sheet.
The amount of extra volume the Ultralight Sheet affords underneath the Zenbivy Ultralight Muscovy 25 means you can wear more layers to supplement the insulation without that compressing your down quilt. And with the Sheet's built-in hood, additional insulation can be added above the head as well. The Zenbivy Bed also offers the option to add a warmer sheet to the sleep system (another accessory item sold by Zenbivy), creating even greater versatility. However, this points to a vendor “lock-in” strategy that is seen with other sleeping bag or bivy systems. So, rather than “Versatile,” we would call the Zenbivy System “Optimizable.”
The Ultralight Sheet's hood can be used to replace what's often missing in a quilt. If you decide to utilize it yourself, you may do so “au naturel” as well as with your own provided insulation, like a down jacket.
Features
Testing the Zenbivy Ultralight Muscovy 25 with its complementary Ultralight Sheet ranks high in features, mostly thanks to the bed sheet.
Primarily, the bed sheet allows the quilt itself to spread out over you, rather than wrap around you, while also providing a cover between your pad and the quilt to remove drafts. This accessory also means the quilt benefits from an honest-to-goodness pad sleeve (rather than just pad attachment straps) to keep your pad from slipping away. The integrated hood provides a space to nestle your pillow, ensuring it stays in place. A small hook is even available to secure pillows with compatible loops.
Getting your quilt, pad, and bed sheet all working together will take a minute the first time you try to set it up, so we suggest doing so before your first big trip out with the system.
The Ultralight Sheet system of the Zenbivy Ultralight Muscovy 25 Bed functions in part much like a sleeping pad sleeve, keeping the pad (and your pillow) in place.
Credit: Justin Simoni
Without the Ultralight Sheet, the Zenbivy Ultralight quilt can function much like a conventional quilt, albeit one with pared-down features. The footbox lacks any way to spread it out, so you'll be stuck with a closed-up footbox. Likewise, the top side doesn't have a way to wrap it closely around your neck. No zipper runs any length of the quilt, either, to transform it into a hoodless sleeping bag.
Materials-wise, there's not much to the Ultralight Sheet, but you'll have to “weigh” the advantages/disadvantages of this extra piece of gear for yourself.
Should You Buy the Zenbivy Ultralight Muscovy 25 and Ultralight Sheet?
If you're struggling to get comfortable in your ultralight sleep system because you feel too claustrophobic inside a sleeping bag, your tossing and turning lets in drafts that ruin a good night's sleep, or you find your quilt system isn't holding onto your sleeping pad or pillow, the Zenbivy Ultralight Muscovy 25 coupled with the Ultralight Sheet is made for you.
The Ultralight Sheet is attached to the Ultralight Muscovy 25 using an array of small hooks and loops you'll have to attach before getting in.
What Other Ultralight Sleeping Bags Should You Consider?
If you're looking for a quilt that's generously sized on the shoulders and hips, check out the Feathered Friends Flicker 40 UL. Its 62-inch shoulder circumference is wider than even some sleeping bags, and its full-length zipper allows it to be converted into a hoodless bag if desired. The Big Agnes Fly Creek UL 25 also features a generous 60-inch shoulder girth, along with a center zip that relieves any feelings of claustrophobia, eliminating the need to hunt for a zipper by your side.
Come sail away with the Zenbivy Ultralight Muscovy 25 Bed!
Credit: Justin Simoni
Side-by-Side Comparison
Compare Zenbivy Ultralight Muscovy 25 Bed versus top competing products:
—Justin Simoni
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