#beanie magic

Why does this MONALISHAMAGIC beanie look like a new one when you go out? Indoors is color A, and it changes to color B in seconds when you go outdoors. MONALISHAMAGIC photochromic beanie looks like an invisible color-adjusting hat. When ultraviolet rays come, the whole color slides into another atmosphere. The material is the core secret-using photosensitive yarn, not relying on any external force, "only talking to light". It is not noisy, but it has its own sense of focus. You can never guess who it will become in the sun today.