Cooling fabric with cool-gel core provides a certified decrease in body temperature for maximum comfort during extended periods of sitting. Ergonomic design promotes healthy posture, improves circulation, and relieves spinal pressure. Zero tailbone pressure alleviates pressure on your spine using a unique u-shaped coccyx cutout to support sciatica relief by minimizing contact between tailbone and seat cushion. Premium honeycomb memory foam. Provide ongoing support, and keep seams intact beyond 80,000 uses. Machine-washable cover with anti-slip backing. Black.