This sock is made of 70% Merino Wool, 25% Nylon, and 5% Spandex, offering a heavyweight construction with a full cushion leg and foot for ultimate comfort. The high-quality Merino Wool provides superior moisture control and warmth, ensuring dry and comfortable feet. It features a stay-up leg and top for a secure fit, along with arch support for added comfort. The reinforced heel and toe enhance durability in high-wear areas, ensuring a long-lasting sock life.