Skil-Care Noninflatable Foam/Gel Wedge Seat Cushion is a water-based gel relieves pressure and cools the skin to prevent breakdown caused by perspiration. The side gel improves lateral stability by controlling left-right leaning. The high-density foam adds comfort and prevents bottoming out. The low-shear I launderable outer cover reduces skin damaging friction. The front gel controls forward sliding by eliminating posterior pelvic rotation.