Memory-foam back cushion provides support, comfort and a tactile curve to improve posture Durable Masonite board prevents hammocking in sling-back wheelchair Easily removed as per patient preference Conforms to lumbar curve to support lower back Sealed liner protects foam core from moisture Nylon stretch cover is water resistant, non-slip vinyl back prevents the cushion from sliding and is waterproofAdjustable Straps easily attach to wheelchair Meets flammability standard TB117