The 1000 Mile Ultimate Lightweight Walking sock is a sock within a sock. The 100% Tactel® inner stays with the foot, wicking away moisture, whilst the soft wool-mix outer layer moves with the shoe.  The lack of friction between the layers helps to prevent blisters and reduces wear. With the unique combination of merino wool outer layer and the Tactel® inner layer helps to maintain a comfortable temperature for the foot. New design with HeelPower grips the heel keeping the sock firmly in place and helping to reduce irritation on the skin. Ideal for 3 season walking in all boots.