The MLB (Major League Baseball) Authentic Collection. On-Field uses the same materials as those worn by MLB players on the field, with the exact same design. It uses high-performance materials with high breathability, sweat-wicking and quick-drying properties, and UV protection (UPF50+). ■ 59FIFTY The 59FIFTY is a representative style of New Era. It is an icon of sports and street culture, worn by athletes and influencers around the world. ・About Size It is a true-fitted specification with no size adjustment, and is available in sizes approximately every 1cm. ・About the front panel specification It maintains a beautiful shape due to a special processing with a core on the back side. ・About the visor The flat visor is characterized by its flat shape. You can bend it to your liking.