Smartwool Women's Best Friend Sock wool Women's sock sizes Small (shoe size 4-6.5) Medium (shoe size 7-9.5) Large (shoe size 10-12.5) NOTE Women's size Small fits Youth shoe size 2-4.5) Crew height, cushioned. 76% merino wool, 21% nylon, 2% elastic, 1% polyester. Washer and dryer friendly!