This long-sleeved shirt is a perfect first layer for golf. It is made from ThermoTech, a highly innovative material made from polyester. The hollow fibers offer superb insulation, using an interior layer of air inside each individual fiber. The fiber construction provides a high degree of comfort through its breathability and cotton-like feel to the skin. The material's unrivaled 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.