SmartWool Men's PhD Graduated Compression Ultra Light Socks 48% Merino Wool, 44% Nylon, 8% Elastane Made in USAof Imported Yarn 200 needle construction provides highest knit density while maintaining ultra light weight 20-30 mmHg graduated compression rating aids in post-activity recovery Virtually Seamless toe - 14" overall height Style:SW001322 Machine Wash Warm Gentle Cycle. Do Not Bleach. Tumble Dry Low. Do Not Iron. Do Not Dry Clean.