Callaway Men's Golf Performance Auto Striped Short Sleeve Polo Shirt 96% Polyester/4% Spandex Imported Opti-Dri: transfers moisture away from the body to aid in evaporation OptiShield: create a layer of protection from the sun's harmful ways, UPF 40 OptiStretch: interwoven layers of Spandex to ensure maximum range of motion so the garment moves with the golf swing OptiSoft: designed for ultimate comfort and performance