Callaway Big Tall Performance OptiDri Striped Polo Shirt 94% Polyester/6% Spandex Imported Opti-Dri: transfers moisture away from the body to aid in evaporation OptiStretch: interwoven layers of Spandex to ensure maximum range of motion so the garment moves with the golf swing OptiVent: fabric allows for the garment to have maximum breath-ability Machine Wash Cold, Tumble Dry