Incredibly durable, ultralightweight sock with open-mesh design for warm-weather comfort. WOW Technology™ adds an extra layer of 100% SmartWool Duroyarn™ to high-impact zones for more durability. 74% merino wool, 25% nylon, 1% elastane blend provides itch-free, moisture-wicking comfort. Arch brace holds sock securely in place. Flat-knit toe seam for long-term comfort. Machine washable. Made in USA. Men’s sizes: L(9 to 11-1/2), XL(12 to 14-1/2). Colors: Charcoal, Chestnut, Grey.