Alterra II GTX is a trekking boot with a modern design and technical features that make it extremely versatile and perfect for medium difficulty and medium duration excursions on mixed terrain. Asymmetrical lacing system, combined with the construction of the tongue in stretch Gore-Tex fabric for precision in closure and comfort of fit, Vibram Weave technology tread with bi-density wedge in polyurethane and EVA for optimal grip, stability and cushioning on the most uneven surfaces. The insole-sole-tread body integrates the exclusive AKU Elica Natural Stride System technology, which favors the dynamics of the step and reduces the pressure on the sole of the foot in support and push-off.