100% Waterproof 5mm CR Flex-Foam neoprene liner is 100% waterproof with exceptional comfort, flexibility, shock absorption and heat retention properties; adjusts to the contours of your foot to resist blisters and chafing Breathable mesh lining wicks away humidity and perspiration, allowing air to travel throughout the boot Stretch-fit topline binding snugs calf to keep warmth in and cold & snow out Extended rubber coverage for added protection Lightweight, cushioned EVA midsole for added comfort MS2 bobbed molded outsole reduces weight and improves stability for climbing and trekking; semi spherical lugs provide traction in loose surfaces without being gummed up by debris Pull-tab for easy on and off Estimated height: 36cm/ 14.2" Estimated max calf circumference: 42cm/ 16.5" Comfort Range: -20°F to 50°F / -30°C to 10°C