New Era MLB 59Fifty Diamond Era BP Cap - Men's The newest clubhouse style of the MLB is the Diamond Era BP Cap. The diamond-print fabric is packed with new technology that has been tested and approved by today's top players. This style has increased COOLERA™ moisture-wicking capabilities and breathability. SOLERA™ technology means the dark fabric is not only resistant to fading, but is also working hard to protect you with UPF 50+. The Diamond Era BP Cap is finished off with the same performance sweatband as the on-field cap has. The team's primary and secondary color combinations have been updated, bringing new excitement to the game. 100% polyester. Imported.