When you 've got lots of miles to cover but only want the minimum between your foot and boot, the PhD Outdoor Ultra Light Mini is the perfect trail companion. With our new Shred Shield technology for reduced wear from toes, 4 Degree elite fit system for a more dialed-in fit, and activity-specific mesh zones for additional breathability, this sock was built for mile after mile of trail. PhD: Built for Performance in the Highest Degree. 4 Degree Elite Fit System for a dialed, performance-oriented fit with flex zone at ankle joint. Indestructawool technology features a patent-pending construction method for exceptional durability and comfort. Mesh ventilation zones provide optimum moisture management and maximum breathability. Non-cushioned for maximum performance in close-fitting shoes. Shred Shield helps reduce wear from toes. Sock Height: Mini. Virtually Seamless toe for enhanced comfort. 3.75" overall height. Made in USA of Imported Yarns: 48% Merino Wool, 48% Nylon, 4% Elastane. Machine Wash Warm.