Abstract: An air mattress including an inflatable compartment formed of flexible material and defined by a ceiling, a floor, end walls, and side walls extending between the end walls. The end and side walls interconnect the ceiling and the floor and form the side edges of the inflatable compartment. At least one inflatable tube extends about and connects to the side edges, and when inflated provides support for them. The inflatable tube has a divider wall through a cross-section thereof and an inflatable chamber generally opposite the divider wall. The divider wall and the chamber divide the inflatable tube into first and second opposed inflatable C-shaped side support tubes. The chamber has a main valve passing from the exterior to the interior of the chamber and first and second one-way valves passing from the interior of the chamber to the first and second C-shaped support tubes, respectively.