Use as a blister-preventing base layer under a traditional thick walking sock for 4 season use or as a stand-alone summer sock with lightweight fabric boots. The 1000 Mile Ultimate Liner Sock is a double layer sock: the unique Tactel® inner layer wicks away perspiration to the moisture absorbing outer layer, keeping the feet dry. The combination of fibres and top venting maintains a comfortable temperature for the foot. Arch bracing offers additional support. HeelPower fabric technology grips the heel firmly in place,so no slippage!