Smartwool Womens PhD Run Light Elite Micro Running Socks 56% Merino Wool, 41% Nylon, 3% Elastane Made in USAof Imported Yarn Run-specific fit - Virtually Seamless toe Achilles tab - Narrower profile provides perfect women's-specific run fit. 200 needle construction provides high-density cushioning while maintaining light weight 1.5" overall height - Sock Height: Micro - Style: SW0SW210 Machine Wash Warm Gentle Cycle. Do Not Bleach. Tumble Dry Low. Do Not Iron. Do Not Dry Clean.