Wheelchairs, Mobility Scooters and Accessories Curve, Cushions, Mobility & Daily Living Aids, Mobility Aids & Equipment, Wheelchair Accessories Curve Wheelchair Cushion Size: 18″ x 20″, Cover Type: Comfort-Tek Review by RoomPony June 12, 2018 No Comments 18″ Wide x 20″ Deep Provides Mild Anti-Thrust High Density Molded Foam Fluid Proof Cover Non-Skid Bottom More CU-FV-1820 18″ wide x 20″ deep curve wheelchair cushion with non-skid bottom and fluid proof cover.