If distance running is your thing, then the \w is the sock for you. It is made from a smooth and soft microfiber that is super-breathable helping to manage moisture and provide excellent evaporation. This sock will keep your foot dry and blister-free. With long distance running in mind Teko have designed the sock with full cushioning under the whole foot and around the heel to provide unparalleled comfort, mile after mile. The Achilles Wrap System ensures a snig, secure fit.