The ideal balance of protection and style meet with the run-ready Smartwool® PhD® Run Ultra Light Pattern Low Cut sock! Sold as a one-pair pack. Low-cut sock sits at ankle. Run-specific fit. 200 needle construction provides highest knit density while maintaining ultralight weight. 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. 48% merino wool, 48% nylon, 4% elastane. Machine wash cold, tumble dry low. Imported.