Abstract: An air evacuable support comprising an elongated, airtight and flexible casing partially filled with a plurality of beads which are conformable to a person's body contours. The support can be formed into a seat configuration for placement upon a wheelchair or the like. Apertured baffles located within the casing slow the resulting downward movement of the beads, but also enable the beads to be forcibly moved through them by an attendant for proper bead concentration in areas needing greater rigidity or support. Such rigidity is developed upon evacuation of air from the casing. The seated person is cradled and closely supported by the compacted beads.