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The Smartwool PhD Run UL Mini Socks feature the 4 Degree Fit System, ReliaWool technology for superior durability and a virtually seamless toe. Made of 54% Merino wool, they're naturally anti-microbial and moisture wicking but the added mesh venting zones provide premium breathability and increased moisture management. The ultra light cushion provides minimal cushion for a next-to-foot feel without added bulk. And thanks to the mini height, you'll have protection from debris on the road or the trail. [+]