Improves Seating Posture While Providing Back Support And Comfort * Durable Masonite Board Sercured On Back Of Foam Core Prevents Hammocking In Sling-back Wheelchairs * Conforms To Provide Support To The Lumbar Region * Sealed Liner Protects Foam Core From Moisture * Has A Non-slip Vinyl Back To Prevent The Cushion From Sliding * Weight Capacity: 300 Lbs. * Limited 18 Month Limited Warranty On Cover And Cushion * Compare To Jay Basic Back *