Thermarest EvoLite Self Inflating Mattress Patent-pending AirFrame construction with alternating foam and air channels to reduce weight and pack size while amplifying loft. Unmatched two inches (5 cm) of loft deliver bump-swallowing comfort. Exclusive Atmos Foam beams add stability, support and excellent self-inflation performance, with only a few breaths needed to top off the mattress for optimal firmness. Ultralight and compact enough for those looking to move with a minimum through the backcountry. 30d Mini Hex Poly shell fabric.