Split-suede and tough 1000-denier Cordura® nylon upper. Breathable GORE-TEX® waterproof membrane lining. 600-gram Thinsulate™ Ultra Insulation adds warmth. Removable full-cushion footbed. Rubber lug outsole. Cement construction. Lightweight nylon shank fights fatigue. Steel toe rated ASTM F2413-05 M I/75 C/75 EH.