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.4Way Stretch technology enables better movement in every direction.The material wicks away sweat and dries very quickly.Antiodor technology prevents the growth of odorcausing 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.