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When you've got miles to cover but want the minimum between your foot and boot• the PhD® Outdoor Ultra Light Micro is ready to go. Whether it's a trail run at dawn or a hike in the heat of summer• this multi-sport sock features the power of Merino for maximum breathability• moisture management and temperature regulation. Made with Indestructawool™ technology for ultimate durability and the 4 Degree® elite fit system to keep the sock in place.