SmartWool Men's PhD Ski Ultra Light Socks 56% Merino Wool, 41% Nylon, 3% Elastane Knit in USA 200 needle construction provides highest knit density while maintaining ultra light weight Virtually Seamless toe 14" overall height Style:SW015029 Care: Machine Wash Warm Gentle Cycle. Do Not Bleach. Tumble Dry Low. Do Not Iron. Do Not Dry Clean.