Designed to offer comfort and positioning for home, office or in the car, Lumbar Cushions from Drive and Mason Medical are made from molded foam and come with a cloth cover with elastic straps. Designed to offer comfort and positioning for home, office or in the car. Durable Masonite board secured on back of foam core prevents hammocking in sling-back wheelchairs|Memory-foam back cushion provides support, comfort and a tactile curve to improve posture|Conforms to lumbar curve to support lower back|Sealed liner protects foam core from moisture|Non-slip vinyl back prevents the cushion from sliding and is waterproof