Smartwool PhD® Run Light Elite Micro Socks Smartwool's best fitting, most advanced run socks yet, packs 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, mens-specific mesh ventilation zones and a Virtually Seamless toe. Features: Sock Height: Micro Body-mapped mesh zones for added breathability Virtually Seamless toe for enhanced comfort Achilles tab designed to prevent sock from slipping down into footwear 1.75" overall height Made in USA of Imported Yarn: 56% Merino Wool, 41% Nylon, 3% Elastane Care: Machine Wash Warm, Wash Inside Out. Do Not Bleach. Tumble Dry Low. Do Not Iron. Do Not Dry Clean.