The sheet is sized to fit your mattress and the quilt is sized to fit you.
Locate your height on the ruler below to see which size quilt and sheet/mattress we recommend. Ideally, you'll want to fall somewhere in the middle of the range. If you find yourself in the yellow, you'll probably want to size up for the most comfortable fit.The chart below is based on the average weight for each height. Also note that if you are an "active" or "wide" sleeper (i.e. someone that moves around a lot), you may want to consider sizing up to allow yourself more space to sleep naturally.
When in doubt, size up. Unlike mummy bags, there is no thermal disadvantage to a larger size Zenbivy because it is always free to wrap snuggly around you.Bigger is always more comfortable and just as warm.
Questions? We're happy to help. Let us know your height, weight, and general sleep style and we'll help you find the right size for you.
The sheet is sized to fit your mattress, whether it's one of ours or your current mattress. Our sheets fit both rectangular and tapered mattresses.Note on 4-inch mattresses:our sheets will fit 4-inch thick mattresses withroundedsides, but they do not work on 3D vertical side wall mattresses that are 4" or greater.
DESIGN UPDATE: We are currently in the process of transitioning our fitted sheets over to an adjustable design to accommodate different mattress lengths. These sheets will be named 20", 25", and 30".
20" sheets will fit mattresses up to 20" x 72" x 3.5" 25" sheets will fit mattresses up to 26" x 78" x 3.5" (including 25x72 mattresses!) 30" sheets will fit mattresses up to 30" x 80" x 3.5"
See measurements for max shoulder/hip/foot circumference of each size Bed, along with the dimensions of just the quilt itself.
Dry Sack Sizing
Find your Bed on the image below and match it to its recommended Dry Sack size. Don't worry, with the recommended size there will still be room to throw in your Zenbivy pillow and even a down jacket.You can expect your Bed to compress down to abouthalfthe size of its recommended Dry Sack. (Ex: 7L compresses down to 3-4L, 10L down to 5L, etc)
Note on sheet sizing!
The Core Sheet Insulated does not currently have the adjustable drawstring feature like our other sheets. The 25" sheet will fit the 25x77 mattress perfectly, but please note that while it does work on the 25x72 it will be a loose fit.
Introducing the Core Bed! — The all-new Core Bed is Zenbivy's simplest, softest, and most affordable backpacking bed. Without zippers or a complex convertible footbox, the Core Bed’s simple patent-pending Fast Footbox™ utilizes just one hook to quickly transform the footbox from "mummy mode" for maximum warmth to “wide mode” for maximum space. The proven draft-free clip system keeps things minimal and lightweight while the soft 50d Pongee liner and supple new 30d Nylon Taffeta shell provide maximum home-like comfort.
Includes the Core Quilt 25° Synthetic, Core Sheet Insulated, and a large mesh bag for long-term storage. Mattress and accessories sold separately.
Fast Footbox™ — Without zippers or a complex convertible footbox, the Core Bed’s simple patent-pending Fast Footbox™ technology utilizes just one hook to quickly transform the footbox from "mummy mode" for maximum warmth to “wide mode” for maximum space.
Clip Closures — To keep things lightweight and minimal, the Core Bed uses our proven clip system to connect the backpacking quilt to the separate fitted sheet and ensure a draft-free night of sleep.
Soft, Durable Fabrics — To maximize comfort, the Core Bed features our legendary soft sheet-like 50d Pongee liner and a new amazingly supple and durable 30d Taffeta shell.
The Kylie-curve™ — The patent-pending Kylie-curve™ is a 3/4 length baffle-backed drawstring on the top edge of our quilts. Unlike traditional backpacking quilts that have a drawstring spanning the entire width, the shortened cord length on the Zenbivy quilt cinches only the center portion. It softly seals around your neck while leaving either edge loose to drape at your sides or tuck up into the fitted sheet's hood to block drafts.
Roomy Hood — The sheet’s roomy integrated hood insulates your head and arms and keeps your pillow in place throughout the night. Our insulated Core Sheet is filled with a soft synthetic, rated to 25°F. Core Sheets are also available with an uninsulated hood if you're looking to ditch some weight (learn more below).
Limit Rating: 25º F (-4°C) Comfort Rating: 35°F (2°C)
All Core Quilts are compatible with all Core Sheets, regardless of size. The quilt is sized to fit you, the sheet is sized to fit your mattress. See our full size guide for more information.
Weight (Core Quilt 25° Synthetic) Regular: 2 lb 5 oz (1.05 kg) Large: 2 lb 10 oz (1.19 kg) XL: 3 lb 2 oz (1.42 kg)
Weight (Core Sheet Insulated) 20": 14 oz (0.40 kg) 25": 1 lb (0.45 kg) 30": 1 lb 2 oz (0.51 kg)
Recommended Zenbivy Dry Sack size: 15L (Dry Sack and Compression Caps sold separately)
Without zippers or a complex convertible footbox, the Core Bed’s simple patent-pending Fast Footbox™ technology utilizes just one hook to quickly transform the footbox from "mummy mode" for maximum warmth to “wide mode” for maximum space.
To keep things lightweight and minimal, the Core Bed uses our proven clip system to connect the backpacking quilt to the separate fitted sheet and ensure a draft-free night of sleep.
Large Insulated Hood
The sheet’s roomy integrated hood insulates your head and arms and keeps your pillow in place throughout the night. Our insulated Core Sheet uses synthetic insulation, rated to 25°F.
Soft, Durable Fabrics
With its legendary soft sheet-like 50d Pongee liner and a new amazingly supple and durable 30d Taffeta shell, the Core Bed features our softest fabrics yet!
The 3/4 length baffle-backed Kylie-curve™ drawstring comfortably seals in warmth around your shoulders but leaves the edges free to drape at your sides or tuck into the sheet’s hood to block drafts.
Our sheets are designed to fit most standard size mattresses on the market—both rectangular AND tapered styles! They are available in 20", 25", and 30" widths. See our full size guide for specifics on sheet/mattress sizing.
Check out our uninsulated version of the Core Sheet! Ideal for warmer trips or combined with an insulated hooded jacket, the uninsulated Core Sheets start at just 7 ounces. Compatible with all Core Quilts.
Very comfortable, but temperature rating is very over-rated.
Pros: ZenBivy's customer service was very helpful with my questions. The system itself is very comfortable and I have one quilt and two sizes in sheets, which easily fit my pre-existing sleeping pads. Con: It's not a 25 degree bag . To be honest, I did not buy it as a 25 degree bag, because I'm well aware that most gear manufacturers overstate this rating. However, I spent 10 days camping in the Tetons early this summer in a dry tent on level ground, on a sleeping pad with a 6+ Rvalue and wearing thermals. But without an extra light blanket on the inside of the system, I would have been very cold in temperatures not lower that 38-40F. So for me that's a fail to be advertising it as a 25 degree sleep system. I think most experienced campers and backpackers understand these issues, but it's the newbies I worry about and there is no way I'd recommend this to someone going into a colder situation. I would recommend it for summer backpacking or kayaking and colder car camping when you can bring some extra gear in order to stay warm. I'd buy it again and I'm very happy with it. I'm also happy I went into my purchase with realistic expectations and I wish ZenBivy would reconsider how they do their own temperature ratings.
We're so sorry to hear you were cold! We would love to help find a solution. Please send us an email at email@example.com and we'll figure something out.
-The Zenbivy Team
I haven’t used it yet; I’m just gearing up for a Fall section hike on the AT. Quilt definitely seems to fit the bill, but… I also ordered a mesh bag not knowing that it came in one. Also, it supposedly stuffs into the 7L bag, which I can’t make happen. Luckily, I had ordered elsewhere a 10L bag that it barely stuffs into. The compression ends I ordered? I can’t seem to make them work. Overall, I do feel I wasted some of my money.
So far, so good!
As a 6'7"/250 lbs side-sleeper, I've been camping in my 1980's era XL Hollofill 2 sleeping bag out of necessity, but it's always been snug. At various points over the years, I've tried upgrading, but everything available was too tight in the shoulders/hips, or my feet/head would get pushed together if I tried to stretch out.
Finally decided to try the Zenbivy XL Core Synthetic 25 with the 30x80 sheet paired with the ALPS Mountaineering Nimble Insulated pad.
Haven't been outside yet, but it's an absolute dream combo on the hardwood floor at my parent's house. (Curse you brother, for taking the bed! :) ) But the joke's on him, this is almost as good as a bed.
Looking forward to seeing how it performs outdoors in a couple months at the next Scout campout.
Good setup based on the fact that I've spent a number of nights sleeping in this combo and there was no glaring discomforts or things that made me regret my purchase. I'm still learning how to use the bivy and sheet combo. Overall it's good at maintaining comfortable temperature in the summer.