A serious boot for rugged terrain, the new 10 inch Mountain Extreme 400 is made with a one piece vamp of 2.8 mm top grain leather on top of stiff nylon midsoles with high traction K-Talon outsoles. Waterproof, breathable Windtex membrane and 400 grams of Thinsulate Insulation keeps you warm and dry. Sure to become your favorite boot due to its awesome support, what will really surprise you is just how lightweight and comfortable they are. 4.2 lbs.