FILE- In this Feb. 13, 2013, file photo, Ottawa Senators defenseman Erik Karlsson (65) limps off the ice as a team trainer arrives to help him after Karlsson injured his Achilles tendon during the second period of an NHL hockey game in Pittsburgh. When members of the U.S. hockey team head to Sochi this weekend for the Olympics, in order to protect a vulnerable part of the body they will carry another piece of gear: Cut-Resistant Socks. The high-tech socks are designed to fend off skate blades protecting the calf, the Achilles tendon and foot. (AP Photo/Gene J. Puskar, File)
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