SmartWool PhD Nordic Medium Black

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Don’t let the cold stop you from taking one last lap: the PhD® Nordic Medium sock delivers maximum warmth and breathability when the going gets cold. Built with long-distance comfort in mind, we’ve added our patent-pending Indestructawool™ technology for ultimate durability and our 4 Degree™ elite fit system to create one of our best-fitting Nordic wool socks that won’t bunch, slip, or bind.