The Airmersus Air self adjusting cushion with S.A.T. is anautomatic non-powered cushionwhich provides automatically adjusting comfort and therapeutic support for the prevention and treatment of skin breakdown for wheelchair users. Special Air / Polymer cylinders create deep immersion to relievie pressure on the ischial and coccyx areas. Waterproof stretch-knit cover has an anti-skid base, and is comfortable and removeable for laundering.