100% Waterproof; 4mm CR Flex-Foam neoprene liner is 100% waterproof with exceptional comfort, flexibility, shock absorption and heat retention properties; Breathable mesh lining wicks away humidity and perspiration, allowing air to travel throughout the boot; EVA Midsole for Added Comfort; MS2 Bobbed Molded Outsole; Rear pull tab for easy on/off; Estimated height: 37cm/ 14.6in; Estimated max calf circumference: 42cm/ 16.5in; Comfort Range: Sub Freezing to 65F / 18C; Hi-Vis Roll Down Upper for Comfort and Safety