When the heat is on this shirt helps you keep cool by expertly managing moisture&#8212.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.