Stay on course when the weather cools with this base layer golf top from Callaway. Ventilated fabric with cooling technology circulates air through this long sleeve golf shirt and Opti-Dri™ technology wicks moisture away from your skin to keep you cool and dry. Swing Tech™ fabric with added stretch allows for a full range of motion. A mock neck collar provides additional protection from the wind so you can play through in comfort.. 84% Polyester / 16% Elastane. Upf40 Sun Protection Fabric. Thermal Insulation. Machine Wash. Swing Tech™. Made to maximize your range of motion on every swing, Swing Tech provides noticeably less restriction through re-engineered construction and materials.. Opti-Dri™. Transfers moisture away from your body to keep you cool and dry.