COMPOSITE TOE: Left and right asymmetrical, non-metallic carbon toes, a composite material, offer an unobtrusive fit and are 15% lighter than steel; The Snapline 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; A mesh liner is integrated in these men’s work sneakers to let sweat out without letting water in LACING: KEEN.RATCHETFIT mechanical lacing utilizes an adjustable dial and connected lacing allowing for a precision fit and on-the-fly adjustment TRACTION: Oil- and slip-resistant, non-marking, rubber outsoles 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: Cement construction provides flexible, lightweight performance while a mid-top design delivers classic sneaker style; Nylon shank for midfoot support; Reflective webbing for additional safety and visibility