It is the MLB brand.

MLB is the abbreviation of Major League Baseball. Founded in 1869, it is the first of the four major sports leagues in the United States. Major League Brands is a popular American street fashion and sports brand. After more than a hundred years of development, MLB, which was established in the middle of the last century, has become more than just a way of entertainment or fitness for Americans, but has become a culture. MLB has a long history and fashionable atmosphere, and has become a world-renowned sports fashion culture brand. MLB brand apparel consists of apparel, New Era caps, and Majestic jerseys, with distinctive colors, unique baseball culture, and fashionable styles, reflecting a strong self-awareness and unique hip-hop style.