Features: Hermell Products Inc invalid Ring-foam with White Cover, 16-1/4" x 13", Specially Molded, Comfort And Durability. Specially molded, high-compression polyurethane foam provides the ultimate in support, comfort and durability. Distributes your weight evenly over the entire seating area to ease pressure on sensitive areas. Designed to relieve pressure on sensitive areas, useful for hemorrhoid sufferers and new mothers. Can be on any seating surface to provide optimal seating comfort. Made from high compression molded foam. Features: High-compression Polyurethane Foam. Removable and washable white cover.