BATTLE OF THE BAY San Francisco Giants 1989 World Series Patch New Era 59Fifty Fitted Hats (Glow in the Dark Patch BLACK Floral UNDER BRIM)

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BATTLE OF THE BAY San Francisco Giants 1989 World Series Patch New Era 59Fifty Fitted Hats in Black & Floral Under Brim

Patch: Glow in the Dark

How to make Logo 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.