Features of the Mammut Men's Ducan Pro High GTX Boot A hiking shoe for winter conditions in the mountains Warm lining ensures very good Insulation in cold temperatures down to -25Adeg C MAMMUT Flextron Technology prevents deflection of the foot and provides improved vertical support for more efficient use of energy on hikes and climbs MAMMUT Georganic 3D Technology ensures a natural foot movement from the geometric-dynamic design that is combined with a cut that is organically tailored to the foot A great Fit is ensured by an anatomical last, asymmetric lacing and a mono-tongue for one-sided entry VibramA(R) sole designed specially for winter conditions provides outstanding grip on the icy surfaces