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; bioDEWIX antimicrobial footbed insert topcover with NZYM for odor control and moisture management; Quick cleaning ribbed outsole offers durability and traction on slick surfaces; Pull-tab for easy on and off; Estimated height: 38cm/15in; Estimated max calf circumference: 38cm/15in; Comfort Range: Sub Freezing to 65F/18C