Properties: New Balance seamless long socks designed for winter running. They are made of high-quality materials: 46% polyester with ThermoCool technology, 32% cotton, 20% nylon, 2% elastane. The ankle cuff ensures a snug fit and ensures the sock stays in place without shifting. Thermocool – high functionality achieved by utilizing the properties of Coolmax and Thermolite fibers. Coolmax quickly wicks moisture away from the skin and onto the material's surface. Thermolite provides excellent insulating properties. By combining the properties of these two fiber types, Thermocool combines two seemingly contradictory functions – it warms the body when it's cold and cools it when it's hot. The materials from which the socks are made make them light, airy, comfortable, and fit the foot perfectly.