Anatomical toe box for unique left and right fit. Achilles support keeps your sock in place whislt skiing and the ankle support enhances the fit. Seamless toe closure reduces bulk and prevents blisters and pain in the ski boot from the ski socks bunching up. "Breathe zones" for improved ventilation and the high merino wool content wicks any moisture away fast.Fabric content: 53% Merino Wool, 45% Nylon, 2% LYCRA®