The base layer pull mineral allows you to fully enjoy winter sports. Its perfect composition prevents you from getting too hot in the opening minutes of exercise or shivering when you slow your pace. You will be very comfortable in this mineral base layer made of copper . The copper fiber has a powerful thermal function without overheating, antimicrobial properties and absorbs moisture to keep you dry. In addition, when the copper fiber is combined with other fibers, they create an intimate mixture which gives very soft and durable fabric.