Viaz DFS GTX redefines a new standard of multipurpose footwear for technical and fast mountaineering, demanding trekking and via ferratas. Evolution of the historic AKU Viaz model, it adopts Dynamic Fit technology that dynamically adapts the boots heel tension with your natural stride to increase comfort and stability. The Vibram Croda Litebase sole offers stability, grip and precision, even in the most technical situations, allowing the use of traditional or semi-automatic crampons. It adopts the AKU Elica Natural Stride System to promote biodynamic efficiency. Exclusive AKU Dual Fit System (DFS) technology allows to adjust fit in walking or climbing mode.