This Authentic Collection 59FIFTY is the official on-field cap of Major League Baseball and is worn by every Major League Baseball player. Performance is enhanced through NE TECH featuring COOLERA and SOLARERA. COOLERA moisture management system wicks away sweat while SOLARERA offers UPF50+ protection from intense sunlight. Designed with an embroidered (raised) Arizona Diamondbacks team logo on front and stitched Major League Baseball logo on the rear. Interior includes branded taping and a moisture wicking sweatband. Fitted, closed back.