COMPOSITE TOE: Left and right asymmetrical, non-metallic carbon-fiber toes, a composite material, offer an unobtrusive fit and are 15% lighter than steel; The Skokie work boots for men meet or exceed ASTM F3445 and F2413 M I/75 and C/75 Standards WATERPROOF: KEEN’s highly breathable Aero Waterproof membrane is fused to the upper without glue for long-lasting protection and less impact on the planet; Environmentally preferred premium leather from LWG-certified tannery for cleaner water 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 CONSTRUCTION: Outsole and midsole meets ASTM D471-06 903# oil and isooctane chemical resistance standards; Cement construction for flexible, lightweight performance; Reflective webbing for additional safety and visibility SUPPORT & COMFORT: KEEN.ReGEN lightweight, compression-resisting midsole providing up to 50% energy return with every step; 90° heel (1/2'' Height) helps provide secure footing on ladders, scaffolding, or loose, uneven surfaces