Our #1 performance tee fabric offered in a color-locking, moisture-wicking poloA to expand your uniforming options.. 3.8-ounce, 100% polyester interlock with PosiCharge technology. Flat knit collar. Removable tag for comfort and relabeling. Taped neck. 3-button placket with dyed-to-match buttons. Set-in, open hem sleeves ST550