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 CARBON-FIBER TOE: Left and right asymmetrical, non-metallic carbon-fiber (composite) toes offer unobtrusive fit and are 15% lighter than steel; These boots meet or exceed ASTM F2412 and F2413 M I/75, C/75 EH standards WATERPROOF: KEEN.DRY is a waterproof, breathable membrane liner that lets vapor out without letting water in to keep your feet dry and comfortable; The Independence 8” insulated work boots have a mesh liner that integrates with the waterproof membrane TRACTION: Featuring an oil- and slip-resistant outsole that is lighter weight and more durable than rubber, and a 90° heel (5/8") provides stability and helps "catch or lock" the foot in place; These boots meet or exceed ASTM F1677 Mark II and ASTM F2922 INSULATION & COMFORT: These boots come with KEEN Luftcell, air-infused, and PU midsoles for weightless comfort; Featuring 600G of KEEN.WARM insulation rated at -55°F/-48°C, and a moisture-wicking lining to help keep feet warm and dry