These trendy, ultra-cool Fifty Crew Sport Socks are made in the U.S. from a blend of nylon, polyester and Spandex. They come in SMALL, MEDIUM and LARGE sizes, and they're lightweight enough to wear during any activity. SMALL fits kids shoe size 12-4 or ladies 4-5. MEDIUM fits ladies shoe size 5-10 or men's 4.5 - 8.5. LARGE fits men's shoe size 9-12 or ladies 11-12.