When the heat is on this shirt helps you keep cool by expertly managing moisture—.wicking it away from your skin so you stay drier longer. Odor fighting properties help minimize odor.. 3.8 ounce 100% polyester. Tag free label. Flat knit collar. 3 button placket. Dyed to match rubber buttons. Double needle sleeves and hem. Side vents. * Due to the nature of 100% polyester performance fabrics special care must be taken throughout the screen printing process.