The Matrix™ Alternating Low Air Loss Mattress Replacement provides alternating therapy with the added benefit of low air loss therapy. The Matrix™ ALAL has adjustable alternation cycles of 5, 10, or 15 minutes and also has a static low air loss option. A fowler boost is included on the microprocessor driven blower unit. The Matrix™ incorporates an extremely strong yet quiet blower that works in conjunction with a unique valve system and the microprocessor to provide a surface with impeccable normalization capabilities. The multi-stretch cover provides superior patient comfort and immersion while stabilizing the patients position and eliminating the effects of shear.