These Merino wool socks are made with 60% Merino wool, which is a soft, warm, and durable fiber. Natural finish organic insulation .The socks are medium weight, making them ideal for all seasons. They have a reinforced heel and toe for added durability, and an elastic upper for a comfortable fit. The socks are also moisture wicking, so your feet will stay dry and comfortable all day long. Features: Made with 60% Merino wool Soft, warm, and durable Medium weight Reinforced heel and toe Elastic upper Moisture wicking Benefits: Keep your feet warm and comfortable all day long, Durable construction, Moisture wicking to keep your feet dry, and Comfortable fit.