SockGuy Wool Crew 2014 Penta Cycling/Running Socks (Penta Wool 2014 - L/XL) Stretch-to-fit, 2-size system Materials: 75% TurboWool (50% Merino wool and 50% polypropylene), 15% nylon, 10% spandex Shrink-resistant and itch-free Easy-fit cuffItem SpecificationsColorBlackSizeLargeSizeX-LargeSeasonCool WeatherSeasonWarm Stretch-to-fit, 2-size system