Danner - Fort Lewis 200 Gram 10 (Black) - Mens: Created with the help of two career Army officers from Fort Lewis, Washington, this is the standard other military boots try to live up to. 2.0-2.2 mm waterproof full-grain leather upper. GORE-TEX waterproof bootie liner. 200-gram Thinsulate insulation. Airthotic footbed. 4.3 mm rubber/5.5 mm PU midsole. Stitchdown construction. FORSCOM Approved. Vibram 148 Kletterlift outsole.