Improves Seating Posture While Providing Back Support And Comfort Conforms To Provide Support To The Lumbar Region Sealed Liner Protects Foam Core From Moisture The Stabilization Board Secured On Back Of Foam Core Prevents Hammocking In Sling-back Wheelchairs Has A Non-slip Vinyl Back To Prevent The Cushion From Sliding Weight Capacity: 300 Lbs 18 Month Limited Warranty On Cover And Cushion Hcpcs Suggested Code: E2611 Notice To California Consumers: Warning: This Product Contains Chemicals Known To The State Of California To Cause Cancer And Birth Defects Or Other Reproductive Harm