Featuring an 8mm neoprene bootie with fleece lining wrapped in layers of soft rubber so your feet will stay warm and dry in the most extreme conditions. The outsole features Vibrams 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. 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 Men's Arctic Ice Tall Boot with Vibram Arctic Grip AT - Black