[3][5][10] New Era's contract with the team stipulated that only blue caps could be produced, but the owner worked with MLB to make an exception.

[5] The first 59FIFTY design had a flat visor, with eight rows of stitching, ventilating eyelet holes, and a high rise crown.

[5] This design only underwent minor tweaks until the 1980s, when lighter wool, sweats, and beading were used to make the logos look cleaner, and the stitching was raised.

The team wound up popularizing the gray under-visor because they won the World Series the same season they made the change.

[13][2] Earlier versions of the 59FIFTY were made with 100% wool but eventually switched to polyester, which includes sweat-wicking fabric and sun protection.

[2][5] Collaborators include BTS, Fear of God, Takashi Murakami, Marc Jacobs, MTV, and Chance the Rapper.

[3] The cap is also called Brooklyn style due to New Era's connection to New York and the borough's hip-hop scene.

[17][14] In 2017, Paola Antonelli included a replica of Spike Lee's red Yankees cap in her "Items: Is Fashion Modern?"