Men's CSA Philadelphia 8" Insulated Waterproof Boot (Carbon-Fiber Toe)Features Left and right asymmetrical, non metallic carbon fiber toes offer unobtrusive fit and are 15% lighter than steel KEEN. DRY waterproof, breathable membrane Full grain waterproof leather 90 heel (5 8" Height) provides stability and helps "catch or lock" the foot in place 200G KEEN. WARM Insulation for extra warmth in colder environments Electrical hazard (EH) or Electric Shock Resistant (ESR) footwear provides a secondary source of protection