Unlike ordinary liners that utilize an inconsistent vacuum thermoform process and slippery lower grade plastic these liners are high pressure injection molded from OE-quality Thermoplastic that looks and feels like rubber and provides a nonslip surface. Raised nibs on the bottom provide maximum retention and keep the liner in place. The unique self-sealing floor hook attachment feature helps to prevent dirt and moisture from getting through. Easy to remove and clean. Simply hose them off and go! The mat actually reseals itself around the hook!