Callaway Men's Golf Performance Heather Striped Short Sleeve Polo Shirt 96% Polyester/4% Spandex Imported Opti-Dri: Transfers moisture away from the body to aid in evaporation Opti-Shield: create a layer of protection from the sun's harmful ways, UPF 50 Opti-Stretch: interwoven layers of spandex to ensure maximum range of motion so the garment moves with the golf swing Opti-soft: designed for ultimate comfort and performance