OUTDOOR MONSTER × MOUNTAIN JAM Glow-in-the-dark Patch Brand new, unused item. Purchased from the Mountain Jam official online store. This is a GLOW model that glows eerily in the dark when exposed to sunlight during the day or light from a headlamp. I bought it, but I no longer have plans to use it, so I'm selling it. Size: Approximately 49x47mm Weight: Approximately 8.0g Specifications: Velcro hook backing, Velcro loop included