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Don't let the cold stop you from taking one last run: the PhD® Ski medium delivers maximum warmth and breathability when the going gets cold. Patent-pending Indestructawool™ technology provides ultimate durability to make sure your socks are ready to go, run after run. Made with our 4 Degree® elite fit system for a sock that doesn't bunch, slip, or bind and a women's-specific fit for a narrower heel and overall slimmer fit.

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