The 1000 Mile Fusion Walking Sock breaks that mould with innovative design and material technology.  Conventional sock wisdom dictates that you can either have padding for protection and comfort or two layers for reduced friction.  It provides a sock that offers everything: The 1000 Mile double layer sock\'s BLISTER-FREE GUARANTEE, but with padded comfort and protection.  Just what you need when you\'re in the thick of it.  Achilles Tendon protection: full length padded protection for the Achilles Tendon. Arch bracing: for additional support.  Padded comfort zones: padding on the toe, heel and ball area of the foot for extra comfort and protection.  Double layer construction: eliminates friction between foot and shoe, reducing wear and preventing blisters.  Tactel® inner layer: wicks away perspiration to keep feet dry and cool. (06/11) 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.