Abstract: An inflatable pad or mattress wherein the air cells spanning a central region of the pad or mattress are extended in at least one dimension relative to the air cells of the foot and/or head region of the mattress. The heavier portions of a person's body, including the upper torso and hips, contact the higher air cells, while the lighter portions of the person's body are in contact with the shorter air cells. The pad preferably includes a single air passage interconnecting the various air cells. The air passage includes a flow-throttling device communicating with individual cells, whereby air flow from one cell to another cell is restricted to delay pressure equalization action among the cells.