The Airmersus Adjustable 3-zone cushion is a unique non-powered cushioning system that provides superior comfort and therapeutic support for the prevention and treatment of skin breakdown for wheelchair users.Each cushion contains three air/polymer filled cylinders that maximize femoral support while relieving pressure on the ischial and coccyx areas. It can also be used to support the correction of postural asymmetry, pelvic obliquities and posterior tilt. Waterproof stretch-knit comfortable cover is removeable/washable and has a non skid base.