Indestructawool technology for enhanced durability 4 Degree elite fit system for a dialed, performance-oriented fit Shred Shield technology reduces wear from toes Body-mapped mesh zones for added breathability Virtually Seamless toe for enhanced comfort The ideal balance of protection and style meet with the run-ready Smartwool PhD Run Ultra Light Pattern Micro sock! Sold as a one-pair pack. Micro-cut sock sits below ankle. 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. 50% nylon, 45% wool, 5% elastane. Machine wash cold, tumble dry low. Imported.