Description The Kolb's gel supreme cushion is a pressure-reducing wheelchair cushion designed to assist in the prevention and healing of pressure-sore ulcers. At the core of the Gel Supreme is high quality gel sealed in a leak-proof bladder. This specially designed gel bladder is encased in premium sculpted foam, offering the utmost in comfort. At 3" thick, it is sure to provide supreme comfort. Removable, waterproof, fire retardant cover protects from moisture and stains. Non-slip base ensures that the cushion stays firmly in place.