The popular CF2 - now in a "cali-Crew" height! Utilizing the high performance capabilities of Shadow Yarn, the CF2 transports moisture and heat from areas of highest to lowest concentration for a comfortable, thermally balanced sock. This crew sock is constructed with a cushioned footbed to enhance comfort and extend athletic performance of the foot. 78%Hydrotec Polyester, 20%Nylon, 2%Spandex