MLB and New Era join forces with Polartec to come up with two sets of baseball cap designs that feature finely-selected materials. Take your pick from the Polartec x MLB 59Fifty Fitted Hat Collection. All 30 MLB teams get two hats each for this drop. First is the Wind Pro, an advanced fleece knit fabric, in dark green color. Up next is the Polartec Neoshell, a breathable waterproof fabric, that comes in a black tiger camo design. All hats feature the team logo rendered in white for the front embroidery and gray fabric for the undervisor. The New Era Flag is embroidered in white on the left panel, and at the back is the MLB Batterman logo. Click here to view the whole collection.