Waterproof full-grain leather upper. Breathable GORE-TEX® waterproof membrane lining. 400-gram Thinsulate™ Ultra Insulation adds warmth. Removable full-cushion insole. Vibram® Rubber Lug outsole maximizes traction and performance. Classic Goodyear welt construction is sturdy and flexible. Solid steel shank. Vibram® Rubber outsole maximizes traction and performance. Safety toe rated ASTM F2413-11 M I/75 C/75 EH.