Sport-Tek Ladies PosiCharge Competitor Polo. LST550Our #1 performance tee fabric offered in a color-locking, moisture-wicking polo to expand your uniforming options., 3.8-ounce, 100% polyester interlock with PosiCharge technology, Self-fabric collar, Removable tag for comfort and relabeling, Taped neck, Elongated 2-button placket with dyed-to-match buttons, Set-in, open hem sleeves,