Beauty Skincare This Temporary Tattoo Measures Just How Much Sun Exposure Your Skin Has Gotten By Marianne Mychaskiw Marianne Mychaskiw Instagram Marianne Mychaskiw is a New York-based freelance writer and editor who covers everything from beauty and style, to wellness and entertainment. InStyle's editorial guidelines Updated on July 25, 2016 @ 03:00PM Pin Share Tweet Email Photo: courtesy La Roche-Posay is making temporary tattoos cooler and more useful than ever with the launch of their wearable My UV Patch device, which measures and monitors your skin's exposure to ultraviolet rays. Okay...so maybe the term "temporary tattoo" is a bit of a stretch, but you have to admit—it does sort of resemble one of the cuter designs we'd shell out 50 cents for at the mall vending machine. Crafted with a thin, stretchable material that moves along with your own skin, the patch changes colors to indicate just how much UV exposure your skin has gotten, and you can track the specifics on the cooresponding mobile app to help you stay safe (and your sunscreen to remain fresh). courtesy The 3 Best Invisible Sunscreens to Try Now You'll get a completely customized analysis once you upload a photo of your patch to the mobile app, and considering that it lasts 3 days and is resistant to both water and sweat, it's the perfect companion to your weekend beach vacation. The best part? La Roche-Posay's UV patch will be included with every Anthelios sunscreen purchase made through the laroche-posay.us website, or find the patch at one of the participating physicians near you, which are also listed on the website.