For those who want limited-edition baseball hats, check out this latest Hat Club Exclusive. Swing for the fences and seize the day while rocking the Hat Club Exclusive Mighty Mussels 59Fifty Fitted Hat. The panels of the dome are made of black polyester fabric, while the button and eyelets are in purple. The front design features the Mighty Mussels logo embroidered in shades of purple, yellow and white. The visor has a purple upperbill and a gray underbill. The New Era Flag is embroidered in dark purple on the left panel, while the MiLB logo at the back is in white and two tones of purple. Get yours here.