The Super-Comfort Gel Cushion provides a welcome layer of support between you and your seat! The seat cushion has a gel-filled core that is encased between two layers of high-density foam creating the ideal seat cushion support for those who sit for long periods.  The gel seat cushion also has a removable, washable polyester fabric cover featuring faux sheepskin on top that is cool in summer, and warm in the winter. You can use this gel cushioned seat cover all year long. 18½" x 16" x 4" thick.