1Reusable Design: These stickers are reusable and each time you reapply your sunscreen, the colour change continues throughout the day, providing you with continuous sun protection no matter how long you spend outdoors. 2Color Change Indicator: When exposed to ultraviolet radiation, observe the sticker change from clear to purple or yellow. The shade of the sticker colour varies with the level of the ultraviolet. When the sticker darkens, it is time to reapply sunscreen. 3Effective Protection Methods: The easiest and most effective way to ensure your skin is protected from harmful ultraviolet all day long is with ultraviolet sunscreen stickers that are convenient and quick to apply, so you do not have to worry about missing applications or frequent reapplications. 4Safe: Hypo allergenic and non latex adhesive, these stickers are suitable for children aged 3 years and over in the sun, ensuring that their skin is safely and effectively protected from the sun and helping to prevent sunburn. 5Sun Protection: Say goodbye to sunburn with these ultraviolet stickers. They will show you if you are applying enough sunscreen and when you need to reapply it, thus guiding you on when to reapply your sunscreen.