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When you're way out there, the last thing you want to think about is your feet. That's why Smartwool made the PhD® Pro Outdoor Medium Crew with Indestructawool™ technology, a 4 Degree™ elite fit system, and body-mapped mesh vents for breathability. So you can escape without distractions and feel supported wherever your feet take you. Get out there and explore in some of our most technical hiking socks.