SHOCKPROOF ENGEL® knee pads in expanded thermoplastic polyurethane foam (material made with a minimum of 50% recycled materials). They offer excellent protection thanks to their revolutionary layer of small air bubbles inside a hexagonal structure that provides superior cushioning. Certified to withstand extreme temperatures - from very hot to very cold - without compromising form and flexibility. Compatible with all ENGEL® trousers with support for knee pads and it is not necessary to remove them from the trousers when they are washed.