Wheelchair Accessories - 24"x18" Medline Contour Plus Wheelchair Cushion: 24"x18" The Contour Plus is a Skin Protection and Positioning Cushion The contoured abductors and adductors position the legs and hips in an anatomically correct position. The high resiliency foam cushion features a segmented gel insert and waterfall front that help to redistribute weight and relieve pressure. The incontinent proof polyX cover has four way stretch for better performance and is easy to clean.