Whether you're out for the day or the week, these hiking socks are designed to keep you moving comfortably down the trail. They're made of a Merino wool blend that's naturally breathable to help feet stay dry and reduce friction. Fabric Content: 51% Merino Wool, 38% Nylon, 9% Polyester, 2% LYCRA Spandex Made in USA: This sock is manufactured in the USA using imported fibers. Non-Mulesed Merino Wool Blend: Ethically sourced, non-mulesed Merino Wool blend makes for a naturally breathable, soft, itch-free sock. Flat Knit Design: Using a combination of flat knit design and mesh panels makes for better breathability. Go There: Hidden "GO THERE" message in the interior of the welt. Reinforced Heel & Toe: These socks are designed with a reinforced toe and heel to provide additional durability. Care Instructions Machine was inside out in cold water. Tumble dry low or lay flat to dry. Sock Size Men's US Shoe Size Women's US Shoe Size Small - 4 - 7 Medium 5.5 - 8.5 7.5 - 10 Large 9 - 12 10.5 - 13.5 X-Large 12.5 - 15.5 -