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, black undervisor, 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. This Milwaukee Brewers baseball cap is made by New Era and is licensed by the MLB - Major League Baseball.