Anti-Thrust Wheelchair Cushions with GelDesigned for active residents who tend to thrust or slide forward Keeps self propelled residents securely in their chairs 1" shelf in the middle helps reduce thrusting Softly curved front edge minimizes pressure behind the knees Fluid resistant, Shear X all way stretch cover reduces shear 1 each Anti Thrust Wheelchair Cushion with Gel, 22" x 20" COVER TYPE High Stretch Fluid Proof CUSHION MATERIAL Gel Foam CUSHION TYPE Anti Thrust DEPTH INCHES 16 ",18