Designed to fit wheelchairs 18" - 20" wide, the Skil-Care Wheelchair Leveling Pad eliminates sling-seat hammocking by making wheelchair sling seats flat and level with the chair frame to provide a firm foundation for the addition of a Skil-Care cushion (sold separately). The Skil-Care Wheelchair Leveling Pad solid closed cell foam is covered with an optional incontinent proof vinyl for an added level of antibacterial protection.