ROHO Quadtro Select - Wheelchair/Seat Air Cushion provides a customized fit for added comfort and stability. The Quadtro Select cushion by ROHO matches and tracks the shape of the person, keeping them immersed in comfort while protecting against skin breakdown. This four chamber air cushion features ROHO's unique ISOFLO Memory Control system. There is no need to transfer in or out of the chair during adjustments, a simple twist of a knob allows for quick and easy changes to maximize comfort. Includes: cushion, stretch cover, hand inflation pump, repair kit, and instructions. Each. Sizes vary.