These SINNER Pro Socks are specially designed for long winter sport days with your ski or snowboard boots on. Anatomical left and right foot for optimal comfort and perfect fit. The ventilation channels ensure optimal air circulation, while the reinforced paddings and cushion zones reduce the pressure on your shinbone, ankle and heel. The sophisticated mix of materials ensures that your feet stay warm, dry and protected. Two pairs of socks keep you feet comfy made from: 34% polypropylene, 28% polyacryl, 28% (virgin)wool, 10% polyamide.