Therm-a-Rest NeoAir XTherm MAX Rectangular Lightweight Inflatable Backpacking Air Mattress Rectangular inflatable sleeping 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 Rectangular design offers added ground coverage; textured, no-slip fabric ensures that sleeping bags stay put during the night Suited to lightweight excursions in harsh conditions, the 2.5-inch thick mattress is free of bulky materials and packs to the size of a one-liter water bottle Measures 72x20x2.5 inches inflated, 9x4 inches packed, and weighs 17 ounces; stuff sack and repair kit included