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 Evanston 6-inch work boots for men meet or exceed ASTM F3445 and F2413 M I/75 and C/75 Standards WATERPROOF: KEEN.DRY is a waterproof, breathable membrane liner, keeping your feet dry and comfortable; Full-grain barnyard resistant waterproof leather helps resist the damaging effects of oleic acid, urea, sodium chloride, and ammonium hydroxide COMFORT: Featuring a 400G KEEN.WARM insulation rated at -40 F/-40 C, and moisture-wicking textiles to help keep feet warm and dry; Made with KEEN.ReGEN a lightweight, compression-resisting midsole providing 50% more energy return than standard foam 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; Featuring a 90° heel (1/2" Height) provide grip for increased traction MATERIALS: Featuring textile uppers that meet ASTM D471 #903 standards for oil and isooctane chemical resistance, and have 100% non-metallic construction for passing through metal detectors; A nylon shank used for midfoot support, and torsion stability