Summer fun in the sun is no fun at all when your skin is not properly protected. But too many of us forget to apply that second round of sunscreen. So how about a colorful reminder? The stickers start purple on your skin. The instructions say apply to your upper arm. Next, apply sunscreen on top of the patch but wait 30 seconds before you rub it in. Once your sunscreen is applied, expose the sticker to the sun and it will turn clear after one minute. The waterproof stickers are supposed to last 12 hours and will indicate when it’s time to reapply sunscreen by turning back to purple.
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