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The Smartwool PhD Outdoor UL Micro Socks feature the 4 Degree Fit System which helps to keep the sock in place and offers greater stretch and recovery. Designed with ReliaWool technology for superior durability with a virtually seamless toe and made of 54% Merino wool so they're naturally anti-microbial and moisture wicking. There are also mesh venting zones which provide premium breathability and increased moisture management. The UL (ultra light) cushion provides minimal cushioning for maximum performance in close-fitting shoes and makes the PhD Outdoor UL Micro socks comfortable and perfect for any activity. [+]