The 1000 Mile All Terrain Sock is designed with maximum comfort in mind, no matter how hard the going gets, whether it's a casual walk in the park or a trek up Ben Nevis. The 100% Tactel® inner layer stays with the foot, wicking away moisture, whilst the soft wool-mix outer moves with the shoe. The lack of friction between the layers helps to prevent blisters and reduces wear. Arch bracing for additional support. Flat toe seam for extra comfort. Air flow channels for superior breathability. The unique combination of fibres maintains a comfortable temperature for the foot. (06/11) Available In Mens - Click Here Covered by The 1000 Mile Guarantee! Double layer construction eliminates friction between shoe and sock, thus reducing friction between sock and foot, The skin should therefore not be rubbed by the socks, meaning no wear out for 1000 mile of use and no blisters. Money back or replacement if, within one year from date of purchase, either you experience blisters or the socks wear out within 1000 miles, provided care instructions have been followed and socks are returned with original receipt.