High unisex thermal socks Xcelcius Classic ribbed design and quality material. This is how the Xcelcius Thermo Boot unisex socks can be described, which will be useful for active sports, but also come in handy for leisure wear during the cold days of the winter season, when they offer pleasant comfort. VILOFT® is a 100% natural high-end fiber that gives special properties and functions to textiles. A special fiber whose own technical properties and characteristics create fabrics that insulate the cold and retain heat. Material: 40% viloft, 40% polyester, 20% nylon