Smartwool PhD Ski Light Sock Black / Gray Green Large 100% Wool Light cushioned shin & foot, the Phd Ski Light Sock for men 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. Men's sock sizes - Medium (fits US shoe size 6-8.5) Large (fits US shoe size 9-11.5) X-Large (fits US shoe size 12-14.5) 67% Merino Wool, 31% Nylon, 2% Elastane, washer and dryer friendly