Therm-A-Rest NeoAir XTherm Inflatable Mattress - The Xtherm inflatable mattress is the warmest in the NeoAir collection, allowing you to go lighter than ever in winter conditions. Patent-pending Reflective Barriers give the XTherm sleeping pad true 4-season warmth without the weight or bulk usually found in a winter-worthy mattress. 2.5-inch thickness and patent-pending Triangular Core Matrix construction provides unrivaled stability and comfort for a solid's night sleep. Advanced low-bulk materials and a tapered design reduce weight without compromising warmth. The result is the XTherm weighs under a pound, takes up less pack space than your water bottle, and provides serious comfort in extremely cold conditions. Stay warm on the go with the Therm-A-Rest NeoAir XTherm inflatable sleeping pad.