The Visco Ring Cushion features an innovative design that is ideal for adding supportive comfort to wheelchair or mobility scooter seats. The unique ring shape helps relieve pressure from the coccyx (tail bone) and molds to your unique shape for superior comfort. It is made from therapeutic 'close cell' memory foam, a material that softens with the heat and weight of the body to provide unique shaping for the individual. The Visco Ring Cushion is lightweight and portable, ideal for traveling or day trips where the user will be stationary for long periods of time.