Don't be fooled by recent knockoffs. This is the original Extreme Alpaca tm Sock, produced and processed entirely in North America of North American Alpaca Fiber! Highest alpaca content of any commercially produced sock available today! These heavy socks are perfect for the active outdoorsman. Alpaca's natural wicking ability will keep feet warm & dry. 75% alpaca, 23%nylon, 2% elastic. The sizes are SOCK sizes not shoe sizes. 7-9 socks fit ladies that wear a 5-8 shoe 9-11 socks fit ladies shoe size 8-10, or mens 7-9 shoe 10-13 socks fit ladies that wear a 10-12 shoe, or mens 9-11 shoe 13-15 socks fit men that wear a 11-14 shoe