Show your American Pride with the Original Double Layer sock with a logo of the United States Flag. The RUNNING sock was the first Double Layer product in the WRIGHTSOCK line. It is highly recommended by many marathon runners and triathletes that demand a sock to help prevent blistering under extreme situations! This sock does just that. The construction of lightweight CoolMax does not compromise the fit of the shoe while still allowing two layers of material to absorb the friction with the slight movement between the layers. Feet stay dry as the CoolMax wicks the moisture away from the foot and into the outer layer for evaporation. Many people use this product for a variety of activities in addition to running.