Salewa Men's Alp Flow Mid GTX Alpine Trekking Boots | Hiking, Approaching, Backpacking | Gore-Tex Surround Technology, Vibram Sole, Nubuck Leather Upper Leather Imported Synthetic sole Shaft measures approximately ankle-high from arch GORE-TEX EXTENDED COMFORT & SURROUND LINING: Breathable Gore-Tex liner allows your feet to stay comfortable in changing weather conditions. VIBRAM HIKE APPROACH SOLE: Vibram Hike Approach sole works well in a wide spectrum of mountain terrains. CLIMBING LACING: Climbing lacing extends right to the toe for accurate adjustment. 3F SYSTEM: The trademark SALEWA 3F System connects the instep area of the shoe with the sole and heel; ensuring flexibility, support and the correct fit where it's needed. IDEAL USES: Hiking, Trekking, Alpine Trekking. WEIGHT: 20.5oz./580g.