Callaway Men's Golf Performance Embossed Chest Color Block Short Sleeve Polo Shirt 60% Polyester/40% Spandex Imported Opti-Dri: Transfers moisture away from the body to aid in evaporation Opti-Vent: fabric allows for the garment to have maximum breath-ability Opti-Cool: fabric Transfers heat away from the body and keeps the garment cool to the touch