Over-the-sockboot features 8 mm neoprene bootie with fleece lining wrapped in layers of soft rubber. Outsole features Vibram’s all-new Arctic Grip A.T. with XS Trek Evo for advanced traction on all terrains including wet ice, snow, mixed/loose surfaces and hard pack. bioDEWIX™ anti-microbial footbed insert topcover with NZYM™ for odor control and moisture management. Extended rubber coverage and lightweight EVA midsole for all-day comfort and support. Comfort rated from -60° to 30°F. 100% waterproof. Heights range from 11"-12", depending on size. 100% Waterproof 8mm Neoprene Bootie for Comfort and Performance (5mm Mid) Fleece Lining for Warmth Extended Rubber Coverage Lightweight Midsole for All Day Comfort and Support 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 Muck Boot Company Women's Arctic Ice Mid Boot with Vibram Arctic Grip AT - Black/Heather