Durable mountain shoes for alpine challenges. The Viaz DFS GTX sets a new standard for versatile shoes designed for technical and fast mountaineering, demanding hiking, and via ferratas. They are an evolution of the AKU predecessor model Viaz and feature Dynamic Fit technology, which allows the tension in the heel area to dynamically adjust to your steps, enhancing comfort and stability. The AKU Dual Fit System (DFS) technology enables you to change the fit between walking and climbing modes. The Vibram Croda Litebase sole provides stability, grip, and precision, even in the most technical situations. The waterproof, breathable GORE-TEX lining protects your feet from moisture and ensures a comfortable wearing climate. Key features at a glance: Abrasion-resistant mountain boots for alpine tours, Dual Fit System ensures an ideal fit, GORE-TEX membrane protects against moisture.