CU-SV-1818 Size: 18" x 18", 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.