Remove the UV sticker from the foil and place it on an uncovered area of skin exposed to the sun.
Apply sunscreen as usual, also over the UV sticker.
After a few minutes, the UV sticker becomes transparent, indicating that the skin is optimally protected.
Transparent = protection provided: As long as the UV sticker remains transparent, the sun can be enjoyed without concern.
Purple = reapply sunscreen: If the UV sticker turns purple, seek shade and reapply sunscreen (SPF 30+).
Important: Not a substitute for sunscreen. Patches may fade in extreme temperatures. Avoid eye contact. Store in a cool, dry place.