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The Smartwool PhD Outdoor 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. Mesh venting zones are added to enhance breathability and increase moisture management. The ultra light cushion reduces bulk and provides minimal cushion for a next-to-foot feel. And thanks to the 3.75 inch mini height, you'll have a little extra protection from debris while on the road or the trail. [+]