The ProFlex 360 Hard Shell Hinged Knee Pads feature an ergonomic hinge design that is built to keep protection comfortably in place whether walking, crawling or kneeling. Combination of a heavy-duty hard shell with a soft nonmarring cap makes these pads versatile for protection on any indoor or outdoor surface - no matter how abrasive or delicate. Unlike other knee pads of this style on the market, the free-moving hinge design enables smooth and full 180-degree extension of the pad when straightening the knee. Thick closed-cell foam padding provides supportive all-day comfort. Extra-large rubber cap maximizes surface area to increase stability and minimize risk of scratching or marking flooring such as tile or linoleum. Wide elastic straps easily adjust for a custom fit on a variety of leg sizes and are designed to sit further apart on the thigh and calf to prevent uncomfortable binding.