COMPOSITE TOE: Left and right asymmetrical, non-metallic carbon toes, a composite material, offer an unobtrusive fit and are 15% lighter than steel; The Targhee 4 work boots for men meet or exceed ASTM F3445 and F2413 M I/75 and C/75 Standards AMERICAN BUILT: Assembled with pride in Portland, Oregon, with a minimal-waste design using the finest materials from around the world; We’re proud to bring footwear manufacturing back to the USA, and to do it all in one of America’s most modern factories 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 MATERIALS: KEEN.FUSION construction fuses the upper to the sole for a longer-lasting bond without solvents; Heat-resistant KEEN.TOUGHSOLE oil- and slip-resistant outsole is lighter weight and more durable than rubber while being rated up to 572°F/300°C 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; Midsole meets ASTM D471-06 903# oil and isooctane chemical resistance standards