Abstract: A flexible covering for reducing vapor transmission to a core of a mattress includes outer and inner coverings respectively forming first and second moisture/vapor/bacteria barriers, the outer and inner coverings being formed of materials having a flexibility sufficient to reduce tissue pressures which cause the formation of pressure sores on the body of a patient. The material of the outer and inner coverings comprise one of a woven and/or non-woven materials having or forming a vapor barrier such that the outer and inner coverings have a vapor transmission of less than 10.7 grams per hour per meter.sup.2. According to one embodiment of the present invention, the covering forms an integral part of the mattress or forms an envelope covering the core thereof.

Abstract: A mattress consists of a foam body having recesses at positions corresponding to the locations of protruding portions of a patient lying on the mattress. Foam blocks can be selectively placed in portions of the recesses. An encasement member encases the foam body and includes a top foam sheet. A bloused waterproof, non-shearing, flame retardant and antibacterial top sheet forms a portion of the encasement member covering the foam sheet. A zipper in the encasement member enchances air circulation into and out of the mattress.