100% Waterproof; Fully lined with 5mm CR Flex-Foam neoprene, 100% waterproof with exceptional comfort, flexibility, shock absorption and heat retention properties; adjusts to the contours of your foot to resist blisters and chafing; Fleece lining for additional warmth; Extended rubber coverage for added protection; Comfort insole; bioDEWIX antimicrobial footbed insert topcover with NZYM for odor control and moisture management; Lightweight, cushioned EVA midsole for added comfort; Rugged rubber outsole offers durability and traction on slick surfaces; Pull-tab for easy on and off; Comfort Range: -40degF to 40degF / -40degC to 4degC