100% non-metallic construction for easily passing through metal detectors in highly-secured areas, Nylon shank for midfoot support, KEEN.ReGEN lightweight, compression-resisting midsole providing up to 50% energy return with every step, Oil- and slip-resistant non-marking rubber outsole, Electrical hazard (EH) or Electric Shock Resistant (ESR) footwear helps provide a secondary source of protection in case of accidental outsole contact with live electrical circuits, Abrasion-resistant synthetic upper with mesh liner provides breathability to help keep feet cool in warm environments, Removable metatomical insole for comfort and support, Left and right asymmetrical, non-metallic carbon toes offer unobtrusive fit and are 15% lighter than steel, Reflective webbing for additional safety and visibility, Meets ASTM F3445-21 and F2413-18 M I/75 C/75 EH standards ; Meets ASTM F1677-96 Mark II non-slip testing standards ; Meets ASTM SATRA TM31 material abrasion testing standards ; and outsole Outsole and midsole meets ASTM D471-06 903# oil and isooctane chemical resistance standards,