MLB partners up with New Era for this year’s official team hats for St. Patrick’s Day. Choose your weapon from the MLB St. Patrick’s Day 2021 59Fifty Fitted Cap Collection. All hats in this pack have a polyester knit material for the dome and uppervisor, in the occasion’s signature green color. The front design features the team logo filled with an alternate logo. The same alternate logo is also embroidered on the right panel. On the left panel is the New Era Flag, and at the back is a white MLB Batterman logo. Grab one now, click here to see purchase details for all 30 hats.