Made from a wool blend the CC-845 is a great pair of socks that keep your feet warm. These socks will do the job in cold environments. Wool Blend Thermal Sock.45% Wool, 34% Acrylic, 9% Nylon, 7% Polyester, 1% Rubber, and 4% Other Fibers. Wicks moisture and dries quickly. Reinforced heel and toe areas for great durability. Odor resistant properties. Shrink resistant. Fine fibers provide itch free comfort. It comes in assorted colors. Size is Men sock size 10-13; shoe size 6-12.