Flex™ Mattress
Flex™ Mattress - 20x72 is backordered and will ship as soon as it is back in stock.
Sold Out?
Sign up to be notified when our restock arrives. Check our Restock Calendar for current ETA.
*You are opting to receive marketing emails from Zenbivy
Return & Exchange Policy
Return & Exchange Policy
International Duties & Taxes
International Duties & Taxes
Size Guide
The quilt is sized to fit you. The sheet is sized to fit your mattress.
-
CLIP quilts and sheets are sold separately.
Sizes can be mixed & matched to create the fit that’s right for you and your mattress. All clip quilts are compatible with all clip sheets regardless of size, style, or temperature rating.
-
ZIP quilts and sheets are sold together.
Your mattress may determine what size quilt you get. For example, if your mattress requires a 30” sheet you will need to get the XL 30” ZipBed which comes with an XL quilt.
If you are an "active" sleeper or have a "wide" sleep position, consider sizing up to accommodate your sleep style.
When in doubt, size up. Unlike mummy bags, there's no thermal disadvantage to a larger size Zenbivy because the quilt is always free to wrap snuggly around you. Bigger is always more comfortable and just as warm.
Quilt Sizing
On the chart below, locate your height and overarm measurement. To get your overarm measurement, stand with your arms hanging relaxed by your sides and loosely measure around the broadest part of your chest and arms.

Sheet Sizing
Zenbivy sheets are designed to fit most standard size mattresses on the market, both rectangular and tapered styles. Sheets fit rounded-edge mattresses up to 4” thick and 3D-style mattresses up to 3.5” thick.
Quilt Dimensions
Backpacking quilts are measured by the cut-fabric dimensions. Filled and lofted quilts will be shorter/narrower. On average:
- 25°F quilts are approximately 2” shorter in both directions, for all sizes
- 10°F quilts are approximately 4” shorter in both directions, for all sizes
Convertible quilts are 6” longer when open/flat.
Circumference
The maximum circumference around your shoulders/hips/feet for each size combination when the quilt is attached to the sheet.


Dry Sack Sizing
Both the quilt and sheet will fit in the recommended Dry Sack size and there will still be room to throw in your Zenbivy SoftTop™ Pillow or a down jacket.
You can expect your bed to compress down to about half the original size of the Dry Sack. Example: 7L compresses down to 3-4L, 10L down to 5L, etc
Description
Description
Featuring our supportive 4-way stretch top and horizontally-cored foam insulation for EN/ISO-matched warmth, the Flex™ Mattress is a great all-around camp mattress for anyone looking for maximum comfort and support.
Specifications
Specifications
-
R-value
-
Weight
-
Inflated Size
-
Packed Size
-
Insulation
-
Fabric
-
Includes
Explore the Features
-
EN/ISO-Matched Performance
Horizontally-cored foam eliminates the cold spots found on most vertically-cored mattresses. The Flex™ Mattress delivers R5 for EN/ISO-matched performance.
-
Exclusive 4-Way Stretch Top
-
Reversible High-Speed Valve
-
Included Inflation Dry Sack