100% Waterproof; Fully lined with 8mm 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; Lightweight, cushioned EVA midsole for added comfort; Extended rubber coverage for added protection; Comfort insole; bioDEWIX antimicrobial footbed insert topcover with NZYM for odor control and moisture management; Vibram Arctic Grip A.T for wet ice traction coupled with XS Trek Evo adding durability and improved grip on wet and dry surfaces; Comfort rated from -60F to 30F