Transform a saggy wheelchair seat into a flat, more comfortable one. Slip the Insert, flat base cushion, inside the cover of your choice and you'll notice a big difference in comfort and posture. Provides firm, level seating; convex bottom eliminates “hammocking” effect often associated with sling wheelchairs. Made of closed-cell, durable foam; wipes clean with damp cloth. Available with a non-slip, vinyl protective cover or without. Meets CA #117 flame retardancy standards. Weighs 1lb.