Why you need a wheelchair cushion?. Included Components Cushion. Fabric Type Ice Silk. Unit Count 1.0 Count. Reclining Position Count 1. Arm Style Armless. Built for Daily Seat: This pressure relief cushion 18″L x 16″W x 3″H fits most wheelchairs for adults, and it can turn seats of office chairs, desk chair, car seats, and dining chairs into comfortable seats.