Ergodyne ProFlex 325 Non-Marring Rubber Cap Knee Pads with buckle closure provide heavy-duty knee protection for jobs requiring frequent kneeling. Non-marring rubber cap won't damage or mark delicate work surfaces. Constructed with 12mm NBR (nitrile butadiene rubber) foam padding that hugs the knee, and covered with durable 840D nylon fabric. Nickel-plated grommets secure the long cap to maintain cap position. Buckle closure and adjustable elastic straps ensure a secure, comfortable fit throughout the day. Long cap design offers extended coverage and added support. Ideal for construction, maintenance, flooring, and other tasks requiring knee protection.