Wheelchairs, Mobility Scooters and Accessories Cushions, Mobility & Daily Living Aids, Mobility Aids & Equipment, Wheelchair Accessories Curve Wheelchair Cushion Size: 16″ x 18″ – Comfort-Tek Cover Review by RoomPony June 10, 2018 No Comments 16″ Wide x 18″ Deep Provides Mild Anti-Thrust High Density Molded Foam Fluid Proof Cover Non-Skid Bottom More CU-FV-1618 16″ wide x 18 deep curve wheelchair cushion with non-skid bottom and fluid proof cover.