DescriptionOur PhD® Run Ultra Light Pattern Micro socks bring together the comfort of Merino with body-mapped mesh zones for added breathability and an Achilles tab to help prevent sock slippage and provide you with a sock that can handle it all. Featuring our 4 Degree™ elite fit system for a dialed, performance-oriented fit, Indestructawool™ technology for enhanced durability, and Shred Shield™ technology to reduce wear from toes, our thinnest running sock helps keep you comfortable in your low-cut running shoes for the long road ahead.4 Degree™ Elite Fit SystemFor a dialed, performance-oriented fit with flex zone at ankle jointIndestructawool™ technology features a patent-pending construction method for exceptional durability and comfortMade In The USAMesh ventilation zones provide optimum moisture management and maximum breathabilityPhDBuilt for Performance in the Highest DegreeShred Shield helps reduce wear from toesUltra Light CushionThe absolute minimum between you and your shoes.Virtually Seamless™ ToeSmoothed out toe seams for ultimate in-shoe fit and comfortFeatures Sock Height: Micro 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 Achilles tab designed to prevent sock from slipping down into footwear Made in USA of Imported Yarns: 46% Merino Wool, 50% Nylon, 4% Elastane CareMachine Wash Warm, Inside OutDo Not BleachTumble Dry LowDo Not IronDo Not Dry Clean