Cooling Fabric with Cool-Gel Core provides certified decrease in body temperature for maximum comfort. Ergonomic design promotes healthy posture, improves circulation, and relieves spinal pressure. Zero Tailbone Pressure. Features premium honeycomb memory foam, anti-slip backing, carrying strap, and machine-washable cover. 18-1/3"W x 14-1/6"D x 2-31/32"H. Black.