Smartwool Men's PhD(R) Pro Light Elite Approach Crew Carefully designed comforts with rugged purpose. Made with the help of Conrad Anker, these socks feature extra cushioning to protect against footwear friction, a 4 Degree(TM) elite fit with flex zone, and body mapped mesh to help make even the most ambitious approaches more manageable. Features: Sock Height: Crew Virtually Seamless(TM) toe Flex zone at ankle joint Achilles strap provides extra protection and warmth Made in USA of Imported Yarns: 55% Merino Wool, 42% Nylon, 3% Elastan