Therm-a-Rest NeoAir XTherm Ultralight Backpacking Air Mattress Four-season inflatable sleeping pad for backpacking and camping offers maximum warmth for weight, ideal for sleeping in cold, wintry conditions Reflective ThermaCapture technology traps radiant heat while Triangular Core Matrix baffled construction provides stability and minimizes heat loss Tapered design reduces weight without compromising warmth; textured, no-slip fabric ensures that sleeping bags stay put during the night The 2.5-inch thick mattress inflates in less than two minutes by blowing into valve, and packs to the size of a one-liter water bottle Measures 77x25x2.5 inches inflated, 11x4.5 inches packed, and weighs 20 ounces; stuff sack and repair kit included