A cover assembly for a patient support including a top portion with the top portion defining a patient support surface and a sealing surface opposite the patient support surface. The cover assembly further includes a bottom portion defining a plurality of open face chambers with each open face chamber including a floor and a plurality of walls extending from the floor towards the top portion. Each open face chamber is connected to, and integral with, at least one additional open face chamber by a hinge. The sealing surface of the top portion covers the open face chambers and is coupled to the bottom portion at each hinge.