This ultralight workhouse is built to inflate fast and keep you insulated in extreme conditions.Features Include:Extreme Warmth; Ultralight Package: Patent pending, reflective ThermaCapture technology and Triangular Core Matrix construction reduce weight without compromising warmth.Fast Inflation: SpeedValve pulls in surrounding air to amplify your breath, inflating the mattress in half the time of traditional valves.Max Comfort: 2.5 inch (6 cm)-thickness, soft-touch fabrics and baffled internal structure provide unrivaled stability and support. MAX shape provides added coverage.Small Packed Size: Free of bulky, conventional insulating materials, the XTherm mattress packs to the size of a one-liter water bottle.Faster Deflation: Auto-reversing SpeedValve deflates mattress in a flash.Stuff Sack and Repair Kit includedDimensions: Regular - 51 x 183 cm (20 x 72 in) Large - 63 x 196 cm (25 x 77 in)