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Whatever your activity enjoy it in the run-ready Smartwool® PhD® Outdoor Ultra Light Crew. Sold as a one-pair pack. Crew-length style sits at calf. Run-specific fit. PhD® technology offers performance to the highest degree. 4 Degree™ Elite Fit System uses two elastics for greater stretch and recovery to keep the sock in place. Indestructawool™ technology features a patent-pending construction method for exceptional durability and comfort. Mesh ventilation zones provide optimum moisture management and maximum breathability. Y-stitch heel. Ultralight cushioning is ideal for varied trail and road terrain. Virtually Seamless™ toe for most comfortable wear. 49% merino wool, 46% nylon, 5% elastane. Machine wash cold, tumble dry low. Imported.