Therm-a-Rest NeoAir Xlite Ultralight Backpacking Air Mattress Ultralight (8 ounces) inflatable air mattress for backpacking and mountaineering offers maximum warmth for the weight, ideal for 3-season alpine adventures Reflective ThermaCapture technology traps radiant heat while Triangular Core Matrix baffled construction provides stability and minimizes heat loss; R-Value 3.2 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 Small measures 47x20x2.5 inches inflated, packs to 9x3.3 inches, and weighs 8 ounces; stuff sack and repair kit included