A NEW LEVEL OF TRACTION TECHNOLOGY The new Vibram Arctic Grip All Terrain outsole with Vibram XS Trek Evo compound provides advanced traction on all terrains including wet ice, snow, mixed/loose surfaces and hard pack; superior grip no matter the season. The winter can be unpredictable, but your footwear shouldn't be. That is why we've developed the Arctic Ice Mid with Arctic Grip. These winter high-performance sport boots step up the warmth factor with 5mm neoprene inner boot layered with cozy fleece lining for ultimate warmth in extreme conditions. The stretch-fit top-line binding keeps the boots snug to your legs to keep cold air out and warm air in. 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 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 Pull-tab for easy on and off Estimated height: 31cm/ 12.2in Estimated max calf circumference: 37cm/ 14.6in Comfort Range: -40°F to 40°F / -40°C to 4°C Lightweight Midsole for All Day Comfort and Support Extended Rubber Coverage bioDEWIX™ Anti-Microbial 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 Warm Lining: Soft, Insulation, Light-weight, Performance Materials for Warmth and Comfort 100% Waterproof 8mm Neoprene Bootie for Comfort and Performance (5mm Mid)