Smartwool Azalea Sock - Women's 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, non cushioned. 70% merino wool, 29% nylon, 1% elastane. Washer and dryer friendly! WOW Technology, with strategic mesh zones for maximum ventilation, supportive arch brace.