This combination therapy 8 mattress replacement system provides both alternating pressure and low air loss to optimize pressure redistribution and manage skin maceration. Mattress can operate in an alternating or static pressure mode. Designed to prevent, treat and manage pressure ulcers in the home, long term care, or acute care setting. Nylon cover is low shear, fluid-resistant, vapor permeable, quilted and zippered. Each one of the 20, 8" deep air bladders are easily removed and replaced. Pillow function maintains the 3 air cells at the head of the bed in static mode for patient comfort. CPR valve allows for rapid deflation.