Description When it comes to running socks, we pull out all the stops to keep making improvements on our products. With brand-new Shred Shield™ technology to help improve wear in the toe box, our PhD® Run Ultra Light Micro socks feature the 4 Degree™ elite fit system and our Indestructawool™ technology for a dialed-in fit and improved durability. Features 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 45% Merino Wool, 50% Nylon, 5% Elastane Style: SW001405 Benefits 4 Degree™ Elite Fit System For a dialed, performance-oriented fit with flex zone at ankle joint Indestructawool™ Indestructawool™ technology features a patent-pending construction method for exceptional durability and comfort Mesh Venting Mesh ventilation zones provide optimum moisture management and maximum breathability PhD® Built for Performance in the Highest Degree Shred Shield™ Shred Shield helps reduce wear from toes Ultra Light Cushion Minimal cushioning for maximum next-to-foot performance without added bulk Care Machine wash warm, wash inside out. Do not bleach. Tumble dry low. Do not iron. Do not dry clean.