HeatGear fabric is extremely soft and smooth, providing exceptional comfort at a very low weight.Strategic mesh panels for better ventilation where you need it.4-Way Stretch technology enables better movement in every direction.The material wicks away sweat and dries very quickly.Anti-odor technology prevents the growth of odor-causing microbes.Ergonomic flat seams for greater comfort and mobility.On the label located on the back of the neck, you can indicate your initials, or a number for easy recognition.