The Smartwool Women's PhD(R) Outdoor Light Crew. Featuring Indestructawool(TM) technology, a patent-pending wool-based durability construction, these socks are ready for any adventure on your list. The women's-specific fit provides an overall slimmer fit and narrower heel. Features: Virtually Seamless(TM) toe 7.5" overall height Sock Height: Crew Made in USA of Imported Yarn: 58% Merino Wool, 39% Nylon, 3% Elastane