Check the listing for details. Self Inflating Sleeping Pad Camping 3.1" Ultra-Thick Memory Foam Camping. Condition: New. Listed at 64.06 USD. Upgraded Valves for Fast Storage: To make camping sleeping pad storage easier, we designed a dual-use valve. well, open the two layers for self-inflating when inflating, however, you need just open the first layer and be sure keep the second layer closed when deflating, in this state, the air only go out but not in, so you storage the pad easier just squeeze out the air.