SmartWool Womens PhD Run Light Micro Socks - Past Season 54% Merino Wool, 42% Nylon, 4% Elastane Made in USA of Imported Yarn Narrower profile provides perfect women's-specific run fit - Virtually seamless toe - Achilles tab 208 needle construction provides highest knit density while maintaining ultra light weight Sock Height: Micro - 1.5" overall height Style: SW0SW367