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 Dover 8” 600G Waterproof work boot meets or exceeds ASTM F2412 and F2413 I/75 and C/75 Standards TRACTION: Oil- and slip-resistant, non-marking, rubber outsoles are used for improved traction that meets or exceeds ASTM F1677 MARK II and ASTM F2913 SATRA Non-Slip Testing Standards; Lug sole patterns provide grip even on slick surfaces 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 Dover 8” 600G Waterproof work boot does have a mesh liner that integrates with the waterproof membrane PROTECTION & COMFORT: 600G of KEEN.WARM insulation is used for extra warmth in colder environments; Electrical Hazard (EH) rated to provide a secondary source of protection from live electrical circuits; Heat resistant outsole rated up to 572° F / 300° C DDITIONAL FEATURES: KEEN Luftcell air-infused, PU midsole is used for weightless comfort; 90° heel (5/8") provides stability and helps "catch or lock" the foot in place; CLEANSPORT NXT provides natural odor protection using probiotics