It's only logical, that as the inventors of the self-inflating mattress, Therm-a-Rest takes their unmatched experience and know-how to move self-inflating technology into the future. Blending the convenience of self-inflation with the comfort of air, the patent-pending EvoLite mattress is poised to become the next greatest thing in outdoor comfort.Atmos Foam: Our exclusive foam is poured in an atmospherically controlled chamber, allowing us precision control over uniformity and loft. The result is the lightest and most compressible foam on the marketAirframe Construction: alternating foam and air channels allow us to drastically reduce weight while amplifying loftSelf-inflating Convenience: Excellent self-inflation allows just a few breaths to top off the mattress for optimal firmness2" of Loft: No other ultralight self-inflating mattress provides this amount of loft and comfortDimensions: 20 W x 72 L in (50.8 x 182.9 cm)