COMPOSITE TOE: Left and right asymmetrical, non-metallic, carbon-fiber safety toes offer unobtrusive fit and are 15% lighter than steel toes, and meet or exceed ASTM F2412 and F2413 EH standards WATERPROOF: KEEN.DRY is a waterproof, breathable membrane liner that lets vapor out without letting water in for keeping your feet dry and comfortable; this boot does have a liner that integrates with the waterproof membrane TRACTION: Oil- and slip-resistant, non-marking, siped, rubber outsoles disperse liquid underfoot for improved traction that meet or exceed ASTM F1677-96 and F2913 SATRA standards SUPPORT & COMFORT: Featuring KEEN Luftcell, an air-infused, PU midsole for weightless comfort and a removable, dual-density PolyAer PU insole with aerated pillow-top cushioning to keep your feet comfortable while walking on the job site UNDERFOOT PROTECTION: These men's boots are Electrical Hazard (EH)-rated to provide a secondary source of protection incase accidentally coming into contact with live electrical circuits