Foamer Hat

A foamer hat is any type of hat (typically a baseball cap) that is worn by a transit enthusiast. Transit enthusiasts, sometimes called foamers tend to wear hats while filming or riding trains. Foamer hats usually consist of a metro, or commuter rail line or branding, covered in enamel or metal pins of the transit kind.

Justin: “yo check out my foamer hat”
Everyone else: “WE DON’T CARE”