New York Yankees Stadium Patch New Era 59Fifty Fitted Hat in Glow in the Dark Logo Gray Cotton Canvas (Carhartt Canvas) & 3M Reflective Under Brim.

Logo: Glow in the Dark

How to make Patch Glow in the Dark:

Simply Expose Logo to Sunlight (or bright light) for at least one full minute to activate the green phosphorescent glow. The longer it is exposed, the longer and brighter the afterglow will be.