Shade UV Stickers are designed to let you know when your sun protection is running out. Using patented Dermatrue technology, these stickers turn purple when exposed to UV!
Apply your UV sticker to clean dry skin and apply your chosen SPF over it, as you regularly would. As the SPF protection potency "runs out" the patch will gradually turn purple, alerting you to reapply your sunscreen. After reapplying your sunscreen the patch will turn clear again - you do not need to use a new patch with each sunscreen application!
We recommend using a new patch when the sticker starts falling off, or after 12 hours of use.