This is the Sock Guy Wool Sock. Made from TurboWOOL-- a superior blend of 50% Merino WOOL and 50% polypropylene. This blend is 5 times the strength and durability of Merino wool alone. Shrink-resistant and itch-free our Wool socks will keep your feet drier and provide excellent insulation in all weather conditions. Our Wool socks also feature our "Easy-Fit" cuff and "Stretch-to-Fit" sizing system for maximum fit and performance. Our WOOL socks out-wick and evaporate moisture better than any other wool sock on the market today. Features: Materials: 75% TurboWool (50% Merino wool and 50% polypropylene), 15% nylon, 10% spandex Easy-fit cuff Stretch-to-fit, 2-size system Shrink-resistant and itch-free