Description Our best fitting, most advanced run socks yet, we packed years of testing, prototypes and running smarts into these socks. Featuring Light Elite cushioning in the ball and heel of the foot for ultimate shock absorption with minimal in-shoe volume, men’s-specific mesh ventilation zones and a Virtually Seamless™ toe. Features Indestructawool™ technology for enhanced durability 4 Degree™ elite fit system for a dialed, performance-oriented fit Body-mapped mesh zones for added breathability Virtually Seamless™ toe for enhanced comfort Achilles tab designed to prevent sock from slipping down into footwear Women's specific fit; narrower heel and slimmer fit 56% Merino Wool, 41% Nylon, 3% Elastane Style: SW0SW210 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 Light Elite Cushioning Targeted cushioning on the ball and heel of the foot offers impact protection with minimal in-shoe volume Ideal for close-fitting cycling shoes PhD® Built for Performance in the Highest Degree Care Machine wash warm, wash inside out. Do not bleach. Tumble dry low. Do not iron. Do not dry clean.