Sport-Tek PosiCharge Competitor Polo. Our #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; Flat knit collar; Removable tag for comfort and relabeling; Taped neck; 3-button placket with dyed-to-match buttons; Set-in, open hem sleeves.