The Therm-A-Rest NeoAir Sleeping Pad is one of the world's most advanced sleeping pads available. Not only does it weigh only 14 ounces in it's regular length, but the NeoAir packs down to the side of a one liter water bottle so it takes up next to no room in a pack. This ThermARest utilizes your body heat to reflect heat back to you keeping you three times warmer than any uninsulated air mattress. With it's Triangular Core Matrix construction, the NeoAir provides very stable comfort for a non-self-inflating air mattress. Because there's no insulation in the NeoAir, you don't have to worry about exhaled moisture decreasing performance. When you need to travel fast & light, sleep on the next best thing to sleeping on air, the ThermARest NeoAir Sleeping Pad.