Side Patch Logo: Glow in the Dark Glow in the dark only works when you charge the hat by exposing the hat in the light and then going into the darkness right away. It does NOT glow in the dark continuously or without charging. The glow in the dark effect fades fairly quickly. 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.