Specifications Uses: Support spine, back, and coccyx Relieve spine, back, and coccyx pressure and pain Dimensions: Small Width: 16” Length:16" Depth: 3” Standard Width: 18” Length:16" Depth: 3” Large Width: 20” Length:16" Depth: 3” Materials: Inner Gel Layer Supportive Foam Layer Waterproof Seal Removable Cover Materials Contain Latex What’s Included: Wheelchair Cushion 60 day guarantee UPC: 028841242267 (16x16); 028841242267 (18x16); 028841242267 (20x16) Product Number:CSH1014S (16x16); CSH1014 (18x16); CSH1014L (20x16)   Shipping Weight: 5.6 pounds