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Colorado Rockies 25th Anniversary New Era 59Fifty Fitted Hat (Glow in the Dark Gray Turquoise Under Brim) Size:7 7/8 The under brim is GrayColorado Rockies 25th Anniversary New Era 59Fifty Fitted Hat in Gray with Turquoise 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.