Vasque - Alpine GTX (Black) - Men's: Mountaineering footwear has never been "nimble"...until now!; Equally comfortable on extended alpine treks or peak bagging expeditions to 14ers the world over. 3.2mm Perwanger Leather Upper for outstanding comfort and durability. Features the Light Alpine Monoflex Insole which is an important footwear component that contributes to the support, stability and flexibility of footwear. The insole program includes five unique insoles designed of Hytrel, an advanced chemical from DuPont. The 5 unique insoles have been biomechanically shaped and graded to precisely match each individual size and to provide proper foot roll. This ensures the heel placement, flex point and lateral stability remain proportional for all sizes. Vibram Clusaz Dual Density Rubber is molded into diverse, angled lug shapes. GORE-TEX liner and supportive-yet-flexible Vibram sole. 3-Bar Knit Nylon lining. Tri-Wick Contoured footbed. Gemini Double Tongue. Padded Collar for extra comfort. Crampon Compatible. Shoe weighs 4 lb 7 oz. At Vasque they are in it for the long run. The question is, how far do you want to go?