Support surfaces, such as alternating air mattresses are used to reduce the pressure on an open wound. Per the NPUAP the definition of a support surface is as follows: “A specialized device for pressure redistribution designed for management of tissue loads, micro-climate, and/or other therapeutic functions (i.e. any mattresses, integrated bed system, mattress replacement, overlay, or seat cushion, or seat cushion overlay).” There are several different components of a support surface (such as air, foam, gel, water).