After the stressful day, try slipping into our soft and cushy terry slipper socks. It's a little bit of luxury! 75% alpaca 23% nylon 2% elastic. The sizes are SOCK sizes not shoe sizes. 7-9 socks fit ladies shoe size 5-8 9-11 socks fit ladies shoe size 8-10, or mens shoe size 7-9 10-13 socks fit ladies that wear a 10-12 shoe size, or a mans 9-11 shoe size 13-15 socks fit men that wear a 11-14 shoe