Don't let the cold stop you from taking one last lap: the PhD® Nordic Medium delivers maximum warmth and breathability when the going gets cold. Built with long-distance comfort in mind, Smartwool has added their patent-pending Indestructawool™ technology for ultimate durability and their 4 Degree® elite fit system for socks that won't bunch, slip, or bind.
62% Merino Wool, 35% Nylon, 3% Elastane
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