Muck Boot® Men's Arctic Sport is their tall Wellington boot for extreme winter weather conditions. These boots step up the warmth factor with soft fleece lining and a 5mm Neoprene inner boot for ultimate warmth in harsh cold conditions. The stretch-fit top-line binding keeps the boots snug to your legs to keep cold air out and warm air in, and provides the perfect fit for wide calves. As well as having an EVA molded sole for supreme comfort, these high-performance sport boots feature an added 2mm thermal foam underlay for extra warmth. For those extra muddy or frozen days, the outsole is rugged, durable and offers ultimate protection with double reinforcement on the instep, heel and Achilles area. 100% Waterproof Fully lined with 5mm Neoprene for flexibility Fleece lining for warmth 2mm Thermal foam under the footbed for extra warmth Lightweight EVA midsole for added comfort Pull-tab for easy on and off Rugged outsole with grip Product Features: Outsole:Molded Rubber traction Lining:5mm Neoprene bootie with four-way stretch Nylon Upper:Rubber and Neoprene Comfort Range:-40°F to 60ºF Height:16.5" Waterproof:Yes Midsole:2mm Molded EVA (Ethyl Vinyl Acetate) Foam Calf Circumference:16.5" Muck Men's Arctic Sport Hi Extreme-Conditions Boot