Therm-a-Rest NeoAir Xlite Women's Ultralight Backpacking Air Mattress Ultralight (12 ounces) women's-specific inflatable air mattress for backpacking and mountaineering offers maximum warmth for the weight Reflective ThermaCapture technology traps radiant heat while Triangular Core Matrix baffled construction provides stability and minimizes heat loss; R-Value 3.9 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 2 minutes by blowing into valve, and packs to the size of a one-liter water bottle Measures 66x20x2.5 inches inflated, 9x4 inches packed, and weighs 12 ounces; stuff sack and repair kit included