This Gel-Foam Vinyl X-Cushion w/Coccyx Cutout is designed with an inner baffle for stability. The water-based gel relieves pressure and cools the skin to prevent breakdown caused by perspiration and heat build-up. High-density foam adds comfort and prevents bottoming out. The Low-Shear launderable outer cover reduces skin damaging friction while the incontinent-proof vinyl inner cover prevents urine from entering cushion and wipes clean for easy care. Size: 20"W x 16"D x 2.5"H.