Smartwool Women's Cosmic Poppy, Aegean Heather size M 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) Micro height, non-cushioned. 51% merino wool, 46% nylon, 3% elastane. Washer and dryer friendly!