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The Smartwool PhD Run UL No Show socks are the lowest profile running socks on the market that offer the 4 Degree Elite Fit System which provides greater stretch and recovery to ensure your sock stays in place. Made of 51% Merino wool, these socks are naturally anti-microbial and moisture wicking. To aid in moisture management and breathability, Smartwool added specific mesh venting zones. With a virtually seamless toe and ultra-light cushion, these socks are great for runners of all skill levels, on the trail and on the street. [+]