Smartwool Women's PhD Ski Light Sock, Claret size M 100% Wool Made in USA and Imported Light cushioned shin & foot, the Phd Ski Light Sock for women will keep you comfortable on the slopes, thanks to WOW Technology in high density impact zones, shock and abrasion are reduced. The 4-Degree Fit System keeps the sock in place. 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) 66% Merino Wool, 32% Nylon, 2% Elastane, washer and dryer friendly