Keen Journey Comfort Convex Cushion offers pressure redistribution and comfort. Tru-Relief viscoelastic Memory Foam conforms to the individual. Convex bottom to fill wheelchair sling seats. Incontinence proof washable cover with non-skid base and waterproof zipper. SADMERC approved for up to stage I. HCPCS code E2601 (General Use). 2"H cushion has 250-lb. limit, 3"H cushion has 275-lb. limit.