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 with rounded sides, 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.
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 about half the size of its recommended Dry Sack. (Ex: 7L compresses down to 3-4L, 10L down to 5L, etc)
The Fast & Light Bed 25° combines our Light Quilt 25° with our Fast Sheet to give you a complete Bed at the lowest possible weight. It's a minimalist setup with no sacrifice to comfort!
What is a Fast Sheet? We would never make you use a constricting quilt strap system... Straps not only pin you to your mattress but they end up leaving drafty gaps between the attachment points. The Fast Sheet is a half-length sheet with an uninsulated hood starting at just 3 oz but it packs a punch by protecting you from drafts, housing your pillow, keeping your quilt from sliding off you, and adding comfort to your mattress with its smooth 20d Nylon Taffeta. The Fast Sheet features the same hinged "wing" design as our other sheets, so you can move around easily without constriction and without fear of drafts.
Includes the Light Quilt 25°, Fast Sheet, and an extra-large mesh bag for long-term storage. (Mattress, pillow, and dry sack sold separately)
Zipper-less Configuration —The Fast & Light Bed is equipped with a series of color-coded hooks & loops to save weight and add versatility. Our Light Quilts are offered in two styles: Fast Footbox™ or Convertible Footbox. The Fast Footbox™ is our simplest, lightest, and quickest. With a single clip and minimal fuss, it easily converts from warm “mummy mode” to spacious “wide mode”. In addition to both mummy and wide modes, our Convertible Footbox also unclips to lay completely flat. The Convertible Footbox provides maximum versatility in warmer temperatures and when used with accessories.
Light & Compact — Starting at just 1 lb 7 oz and compressing down to about 3-4L in size, the ultra-compact Fast & Light Bed 25° is the best choice if you're an ultralight backpacker looking for comfort and performance at the lowest possible weight and bulk.
Comfortably Light Fabrics — You'll find that most down backpacking quilt makers shed weight by using thin, clingy 10d fabrics. We found more clever ways to ditch ounces while keeping the fabric a very smooth, comfy, and durable 20d. 20d fabrics are much softer than traditional ultralight tech fabrics while being only a fraction heavier. Definitely worth it!
The Kylie-curve™ — The Kylie-curve™ is a 3/4-length baffle-backed drawstring along the top of the quilt. The shortened drawstring length cinches only the center portion, so it softly seals around your neck but leaves either edge loose to drape at your sides or tuck up into the sheet’s hood to block drafts.
Quality Insulation — The Light Quilt is filled with premium 800 fill-power HyperDRY™ down. This down uses a natural wax-based compound to make it water resistant. It is durable, fluorocarbon-free, and RDS (Responsible Down Standard) compliant.
Thermally Mapped Baffles — We designed our quilts to maximize thermal efficiency, distributing down to provide the most warmth where it’s needed. Smaller baffles minimize down-shift, vertical baffles around the upper body prevent down from sliding, and horizontal baffles on the top of the foot box keep down from shifting with foot movement.
Integrated Hood — The Fast Sheet features an integrated, uninsulated hood. On cold nights, you can tuck the corners of the quilt up into the hood to block drafts around your neck and shoulders. The hood also acts as a cubby to keep your camp pillow from wandering away in the middle of the night.
Limit Rating: 25°F (-4°C)
Comfort Rating: 35°F (2°C)
Quilt Weight (Fast Footbox™)
Regular: 1 lb 4 oz (0.57 kg)
Large: 1 lb 7 oz (0.65 kg)
XL: 1 lb 11 oz (0.76 kg)
Quilt Weight (Convertible Footbox)
Regular: 1 lb 5 oz (0.59 kg)
Large: 1 lb 8 oz (0.68 kg)
XL: 1 lb 12 oz (0.79 kg)
Fast Sheet Weight
20": 3 oz (85 g)
25": 3.5 oz (99 g)
30": 4 oz (113 g)
Fits On Mattresses...
20" Fast Sheet: up to 20” wide by 3.5" thick (51 x 9cm)
25" Fast Sheet: up to 26” wide by 3.5" thick (66 x 9cm)
30" Fast Sheet: up to 30" wide by 3.5" thick (76 x 9cm)
All Fast Sheets are compatible with all Light Quilts, regardless of size or footbox style.
Flat Quilt Dimensions*
Regular: 78” x 54” (198 x 137cm)
Large: 86” x 58” (218 x 147cm)
XL: 90” x 64” (229 x 163cm)
*Please note that the listed quilt dimensions are for the cut fabric. Filled, lofted quilts will be several inches smaller in both length and width.
Recommended Dry Sack Size
The 7L Dry Sack will fit all sizes of the Fast & Light Bed 25°. You can expect your quilt and sheet to compress down to about half the size, or 3-4L. Dry Sacks are sold separately.
Down: 800 fill-power HyperDRY™ fluorocarbon-free water-resistant 90/10 duck down
Fabric (lining, shell, sheet): 20d Nylon Taffeta, coating-free, 380T, cire, fluorocarbon-free DWR, 36g/m2
Clips: Nifco HND5L, HND7
The Light Quilt uses a series of color-coded hooks and loops to form the footbox and attach the quilt to the sheet. This not only sheds the weight of heavy zippers, but gives you more versatility in how you choose to clip it!
The Kylie-curve™ is a 3/4-length baffle-backed drawstring along the top of the quilt. The shortened drawstring length cinches only the center portion, so it softly seals around your neck but leaves either edge loose to drape at your sides or tuck up into the sheet’s hood to block drafts.
No thin, clingy 10d fabrics here. We found more clever ways to ditch ounces while keeping the fabric a very smooth, comfy, and durable 20d.
The Light Quilts use top-shelf 800 fill-power HyperDRY™ down, using a natural wax-based compound to make it water resistant. It is durable, fluorocarbon-free, and RDS (Responsible Down Standard) compliant.
The Fast Footbox™ is our simplest, lightest, and quickest. With a single clip and minimal fuss, it easily converts from warm “mummy mode” to spacious “wide mode”.
In addition to both mummy and wide modes, our Convertible Footbox also unclips to lay completely flat. The Convertible Footbox provides maximum versatility in warmer temperatures and when used with accessories.
By attaching the quilt to the hinged "wings" of the sheet, it's free to get wider where and when you need it while preventing any side drafts as you move.
The sleek and simple half-length Nylon Taffeta sheet weighs in at just a few ounces! Maximum benefits at minimal weight.
On cold nights, tuck the quilt corners up into the hood to block drafts around your neck and shoulders. The uninsulated, integrated hood also acts as a cubby to house your camp pillow.