Double Layer Extension is ideal for users who are at-risk for pressure sores and ulcers, especially in the high-risk heel zone. This two-layer, 200 mm foam mattress extension provides ankles and feet with much needed relief, especially for the mobility-impaired and high-risk patients such as those with diabetes. It and can be used with any 150 mm high foam mattress. Itâ€™s ideal for use in hospital setting, assisted living communities, residential care and home health care. Surface is made of one later of high density memory foam, with a medium density base. Materials are fire retardant and water resistant. Double-stretch, multi-waterproof cover seals moisture out and prevents friction injuries. Welded and taped seams aid in infection control.