The Professional Knee Pads with Superior Gel Cushion are designed with a thick silicone gel that adapts to your knee cap offering unrivaled comfort for lengthy amounts of time spent on your knees. The full-sized, tough abrasion-resistant PVC shell ensures ultimate protection for your knees and a longer life span for the knee pads. While the poly tread cap provides a safe, non-slip, non-marring grip. The velcro straps make for an adjustable, comfortable fit with ease of putting on and taking off.