Order # 17914309 Manufacturer# 1791 Brand AliMed Sit-Straight Manufacturer Alimed Application Coccyx Seat Cushion Color Black Cover Material Polyester Cover Dimensions 18 X 16 Inch Inflation Type Non-inflatable Material Gel / Foam UNSPSC Code 42192208 Wheelchair cushion that alleviates pressure on the coccyx Checkerboard T-Gel layer helps greatly reduce shear forces T-Foam memory foam reduces pressure Built-in solid seat insert helps reduce sling seat sag 3-1/2 inch front transitions to a 2-1/2 inch rear Black AliTex (polyurethane-backed polyester knit) cover