The Muck Boots Arctic Ice Arctic Grip All-Terrain Neoprene/Rubber Men's Hunting Boots features 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 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.Features100% Waterproof8mm Neoprene Bootie for Comfort and Performance (5mm Mid) Fleece Lining for Warmth Extended Rubber Coverage Rugged Spandura Upper for Durability Lightweight Midsole for All Day Comfort and Support bioDEWIX Anti-Microbial Footbed Insert Topcover with NZYM for Odor Control and Moisture ManagementVibram Arctic Grip A.T for Wet Ice Traction Coupled with XS Trek Evo Adding Durability and Improved Grip on Wet and Dry Surfaces Comfort Range: -60AdegF to 30AdegF