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Klymit's Inertia X Frame Sleeping Mat is one of the lightest sleeping mats with the smallest packsize, though there's a small compromise on comfort.
Klymit says:
A radically different approach to sleeping comfortably on air. There’s nothing like the Inertia X Frame™ - it provides support at key pressure points while eliminating every ounce of unnecessary material. It works especially well inside a sleeping bag where the bag’s loft fills the empty spaces in the pad. The X Frame™ also features a customizable pressure valve with hand-pump for precise comfort.
Our Verdict
Comfort wise this pad sits somewhere between a self inflating mat and a full airbed, so It's not as warm or as comfortable as the insulated airbeds that we sell, but It's still pretty comfortable especially when compared to self inflating mats and (God forbid) closed cell foam - and given its pack size and weight I find myself reaching for it every time if I'm going ultralight.
It offers no insulation itself, but does allow your sleeping bag to loft into the pockets to keep you warm - really nice innovation.
- Reviewed by Ultralight Outdoor Gear
Features
- Minimalist Design: Advanced patterning removes all extraneous material to creates an ultralight, minimalist design that delivers comfort and support for only 8.5 oz. and packs to 3” x 6”.
- Body Mapping: Advanced patterning places chambers only where padding is needed and eliminates them where they are not, allowing us to shed significant weight without sacrificing comfort.
- Loft Pockets: Empty spaces between the chambers serve as expansion zones that allow your sleeping bag to fully loft beneath you, maximizing its thermal performance.
- The Right Size: At 78” long, the streamlined size is tapered to fit the body and allows the pad to be used inside or outside of your sleeping bag.
- Inflation and Deflation: The flip valve’s intelligent design allows for micro adjustments to fine tune pressure and comfort.
- Patch Kit included for emergency repairs
Specifications
- Weight: 258g (excludes storage bag + pump)
- Pump weighs: 40g
- Dimensions: 72" x 18" x 1.5" / 182.9 cm x 45.7 cm x 3.8 cm
- ASTM R-Value: Not quoted
- Inflation: 3-5 Breaths
- Packed Size: 3" x 6" / 7.62 cm x 15.2 cm
- Fabric: 30D Top / 75D Bottom Polyester
- Warranty: Klymit Lifetime Warranty
ASTM R-Value:
From 2020, there is a new industry standard for measuring the R-value (level of insulation) of sleeping mats – ASTM F3340-18. This new standard is the sleeping mat equivalent to the EN rating for sleeping bags.
You can now directly compare the R-value of mats rated using the ASTM F3340-18 with confidence that is a fair and accurate comparison between mats. In simple terms, the higher the R-value, the warmer the mat.
In general terms, an R-value below 2.0 is for summer use, 2.0 to 4.0 is for cooler 3 season use and 4.0+ is for winter temperatures. This will be also be dependent on your sleeping bag, how cold you sleep etc. Please contact our customer service team if you need advice on choosing the right mat for your activity.
