59FIFTY MLB On-Field Los Angeles Dodgers Game Authentic Collection of MLB (Major League Baseball). On-Field uses the same materials and design as those worn by players of all MLB teams on the field. 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. Size 7 3/8: 58.7cm Only tried on.