The Mabis Convoluted Foam Ring Cushion is a great choice for users who spend long periods of time sitting, and it is effective in the prevention and treatment of pressure sores. The cushion is constructed of one-piece, puncture-resistant convoluted foam that provides support when sitting for an extended period of time, and reduces pressure point discomfort. The high density foam retains its shape through repeated use, and the ring-shape of the cushion comfortably conforms to the body's contours. This cushion is easy to clean and maintain, and comes with a removable, machine washable polyester/cotton cover, available in plaid or navy. Available in 16" or 18" sizes, this cushion is designed to meet the needs of a wide range of users. Weight capacity: 250 lbs.