COMPOSITE TOE: Left and right asymmetrical, non-metallic carbon toes, a composite material, offer an unobtrusive fit and are 15% lighter than steel; The KS86 Utility work sneakers for men meet or exceed ASTM F3445 and F2413 M I/75 and C/75 Standards CONSTRUCTION: 100% non-metallic construction for easily passing through metal detectors in highly secured areas with ease; Nylon shank for midfoot support; Environmentally preferred premium leather from LWG-certified tannery for cleaner water PROTECTION: Outsole and midsole meets ASTM D471-06 903# oil and isooctane chemical resistance standards; A mesh liner provides breathability to help keep feet cool; Non-mutilating upper reduces the chance of marking or scratching surfaces TRACTION: Oil- and slip-resistant, non-marking, rubber outsoles that meet or exceed ASTM F1677 MARK II non-slip, and ASTM SATRA TM31 material abrasion testing standards; Heat-resistant rubber outsole rated up to 572°F/300°C COMFORT: KEEN.ReGEN lightweight, compression-resisting midsole providing up to 50% energy return with every step; Removable metatomical insole for additional comfort and support