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Conditionally crampon-compatible mountain boot for alpine activities. Lightweight and highly functional, the Tengu GTX is ideally suited for dynamic situations on mixed terrain due to the use of innovative materials. The new Vibram Curcuma profile sole, combined with the exclusive AKU Exoskeleton midsole, provides a high degree of stability and precision both during the climbing phase and while trekking on the approach. Narrow, enveloping lasts for professional footwear in the mountain segment promote precision and sensitivity for use in rock climbing and on ice. The Internal Midsole System is an exclusive technology applied in the construction of the AKU insole. The traditional support structure made of nylon is combined with a layer of microporous material.