Smart and remarkably comfortable first skin, which is a perfect first layer for golf. It is made in ThermoTech which is a highly innovative material made from polyester. A cross section of the fiber, reveals the unique construction - the hollow fibers offer superb insulation, using an interior layer of air inside each individual fiber. The fiber construction also provides the wearer with a high degree of comfort through both its breathability, and cotton like feel to the skin. Lastly, the materials unrivalled wicking ability will transport moisture through the material and let it evaporate from the surface. This function ensures that the wearer is always kept warm and dry, regardless of the weather conditions.