New Era Chicago White Sox Made of 100% Woven Polyester Batting Practice Cap worn during Spring training. Front embroidered team logo with small MLB logo on back. Updated Team Primary and Secondary Color Combinations. 'DIAMOND-TECH BP' has black undervisor. 'DIAMOND-TECH BP' has 59FIFTY infused with the latest NE TECH materials to keep players cool and dry on the field of play. Made with a new state-of-the art performance diamond print fabric, the first-class Diamond Era 59FIFTY is lighter for increased breathability. The premier cap also features SOLARERA™, 50+ UV protection that helps deflect the sun's unforgiving rays and COOLERA™ technology that wicks away sweat to keep players comfortable and dry, allowing them to focus on optimal performance. Performance Sweatband. These DIAMOND-TECH BPs are authentic Chicago White Sox baseball caps made by New Era for official MLB - Major League Baseball teams.