Self Inflating Camping Mat 72" Long X 18" Wide X 2" Thick Brushed polyester on top to hold sheet or sleeping bag firmly in place Sturdy, waterproof material on the bottom, won't mar gym floors; ideal for damp, cold outdoor use Pad will self inflate within a couple of minutes or you can help it along by blowing into the valve Deflate by opening the valve and rolling the pad tightly, starting at the end opposite the valve. Close the valve tightly. For use on ground or on top of your favorite cot!