CU-SV-1820 Size: 18″ x 20″, Cover Type: Stretch-Air Features: -High-density, molded polyurethane foam increases seated surface area, reducing the risk of high-pressure areas. -Mild anti-thrust shelf and tapered adductors. -Non-skid bottom. -Optional hook and loop attachment. Product Type: -Foam Cushions/Comfort Cushions/Pediatric Cushions. Material: -Foam. Size: -Youth: Less Than 15″/Small 15″-17″/Standard 17″-19″/Wide 19″-22″/Extra Wide: More Than 22″. Dimensions: Overall Height – Top to Bottom: -2.75 Inches. Size 22″ x 16″ – Overall Depth – Front to Back: -16 Inches. Size 16″ x 20″ – Overall Width – Side to Side: -16 Inches. Size 10″ x 10″ – Overall Width – Side to Side: -10 Inches. Size 10″ x 10″ – Overall Depth – Front to Back: -10 Inches. Size 12″ x 12″ – Overall Width – Side to Side: -12 Inches. Size 12″ x 12″ – Overall Depth – Front to Back: -12 Inches. Size 14″ x 14″ – Thickness: -2.75 Inches. Size 14″ x 14″ – Overall Width – Side to Side: -14 Inches. Size 14″ x 14″ – Overall Depth – Front to Back: -14 Inches.