The Comfort Hinge design adapts to your movement and ensures improved comfort, fit, and stability. The 1680D ballistic nylon shell, the 420D abrasion-resistant nylon rubber cap, and the durable straps allow for long-lasting use on hard construction sites. The lightweight yet supportive gel foam and EVA foam cushion the knees on rough surfaces. The large, non-slip and soft rubber cap does not scratch or mark surfaces and stays in place. The hinge design, the strategically placed straps, the durable buckle, and the large hook-and-loop fastener prevent the knee pads from slipping. The thick, elastic straps can be easily adjusted for a custom fit. The knee pads were developed and tested for use by airline baggage handlers and are among the toughest knee pads in the industry.