Callaway Men's Golf Performance 1/4 Zip Stretch Interlock Long Sleeve Pullover Top 90% Polyester, 10% Spandex Imported Anti-Pilling Callaway Weather Series Opti-Stretch, fabrics feature interwoven layers of Spandex and Lycra to ensure maximum rage of motion so the garment moves with the golf swing Opti-Therm, Fabric is designed to withstand the cold and provide a layer of thermal comfort