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SupraGel cushion offers the firm yet gentle support your body needs, thanks to high density foam surrounding a gel center that molds to the body. Cut out at back reduces pressure on tailbone and spine, allowing you to sit for hours without discomfort. Removable cover is washable. 18" x 16" x 3". Heavy-duty version has high-density foam along with gel, and is designed for those that weigh over 250 lbs. 18" x 22" x 4".