Blundstone® Men's All-Terrain #2250 utilizes Thinsulate® and leather lining and thermal attributes to maintain warmth and comfort. Premium waterproof Leather Waterproof elastic with latex seams Thinsulate® and Leather lining traps body heat while allowing moisture to escape Contoured EVA footbed with XRD® Technology and Sheepswool lining for maximum warmth and comfort Polyurethane midsole XRD® in the heel for supreme shock absorption Steel shank Vibram® outsole for enhanced grip Fit Tip: AU/UK Australian & United Kingdom sizing = US United States Men's sizing Product Features: Upper:Waterproof Premium Leather Lining:Leather; Thinsulate® Outsole:Vibram® Rubber traction Support (shank):Steel Midsole:Polyurethane Footbed:Contoured EVA (Ethyl Vinyl Acetate) Cushioned Foam with XRD® Technology and Sheepswool lining Blundstone Men's 2250 All-Terrain Thermal Chelsea Boot