CONFORMAX Anywhere, Anytime Gel Car/Truck Seat Cushion (L18SAU) MADE IN THE USA. Proprietary CONFORMAX gel-foam technology means better comfort than gel or foam alone. Absolutely the most comfortable gel seat cushion available. Low-profile comfort. Only 1.5 in. thick with  of Ultrasoft viscoelastic Ultragel gel cast directly onto one inch of Ultravis foam guarantees perfect body-conforming fit to the users anatomy ensuring all day, pain free sitting comfort. Reduces road and vehicle vibration, and enhances fatigue resistance for long-haul, commuting, or every-day driving. These durable, handsome removable zippered covers, with conformable top surface and non-slip friction grip bottom ensure maximum comfort while preventing sliding on most surfaces. TWO AVAILABLE SIZES: 18" (18" length x 20" front width x 14" rear width) and 20" (20" length x 20" front width x 14" rear width). Covers are water and spill-proof for easy cleaning. Color Black, safe for washing. Air dry recommended.