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 Gibson work boots for men meet or exceed ASTM F3445 and F2413 M I/75 and C/75 Standards MATERIALS: The mesh liner in these men’s work boots provides breathability to help keep feet cool in warm environments; Full-grain water-resistant leather; Environmentally preferred premium leather from LWG-certified tannery for cleaner water TRACTION: Oil- and slip-resistant, rubber outsoles that meet or exceed ASTM F1677 MARK II non-slip, and ASTM SATRA TM31 material abrasion testing standards; Electrostatic dissipative (ESD) footwear dissipates excess static electrical charges CONSTRUCTION: Cement construction provides flexible, lightweight performance while a faux-welt delivers classic work boot style; Heat-resistant rubber outsole rated up to 572°F/300°C SUPPORT & COMFORT: KEEN.ReGEN lightweight, compression-resisting midsole providing up to 50% energy return with every step; Midsole meets ASTM D471-06 903# oil and isooctane chemical resistance standards