These ProFlex 230LTR Wide Soft Cap Leather Knee Pads are built tough with real genuine leather to provide excellent traction and knee protection from fire, slag and sparks. The leather is abrasion-resistant from the toughest work surfaces and wraps over the top of the knee pad for extra durability and a longer life for both your knees and the knee pads, even with daily use. They are the most comfortable leather knee pads made with nitrile rubber (NBR) foam padding that keeps its shape over time and helps avoid common knee injuries. Because they are made with soft leather these are the best work knee pads for construction, flooring and concrete applications. Also, the resistance to heat, fire and abrasion makes for great welding knee pads.