Patented all terrain cover suspends the knee, re-directing pressure away from the delicate patella bone. Built with extra 10-mm thick 100 percent injected providing comfort like no other knee pads. All terrain cover is sewn on with extra wide lycra breathable strap and hook and loop fasteners.Made with 100 percent injected GEL and PU foamCover identical to the GEL707 except that the all terrain cover is sewn onThe bottom strap is a wide lycra elastic with a hook and loop fastenerThe extended heel on cover allows user to sit back on heels while working, distributing the body weight evenly which helps eliminate back problems