FEATURES of the Kelty Tru. Comfort Camp Bed Doublewide Sleeping Pad 4.5 in. height provides mattress-like comfort on any surface Horizontal baffles and vertical sidewall construction provide a wide and even sleep surface 140g synthetic insulation provides protection from cold ground TPU-backed 75D polyester for durability Vortex valve triples the amount of air that flows into the bed Secondary dump valve deflates bed in seconds Vortex inflation system requires no batteries, no bulky/unreliable pump, no need to inflate by mouth To inflate, attach vortex bag and open as wide as possible. Close the bag quickly to capture air and push the air into the bed by applying steady pressure