KEEP YOUR FAMILY SAFE FROM THE SUN'S RAYS - No more worrying about when to apply sunscreen to keep your family safe from the sun! This patch does the work for you. No unexpected sunburn only fun in the sun! Sunny Patch is safe for all ages!HOW IT WORKS Sunny Patches will darken to purple based on the UV exposure. Apply sunscreen as normal to both your skin and patch. The patch will turn clear, as the sunscreen protects it from UV rays. The patch will darken as the sunscreen wears off. Once the patch becomes purple, it's time to reapply sunscreen!SAFE, EFFECTIVE, AND CHEMICAL FREE - Created with you and your kids in mind. No chemicals or other worrisome ingredients! Sunny Patches are made with dermatologically safe medical adhesive. They have a UV-sensitive layer that reacts to sun rays and turns purple on UV exposure. Waterproof to stay all day.KID FRIENDLY, PARENT APPROVED - End the sunscreen battles with your little ones with this fun patch! Once the Sunny Patch turns purple, it is time to reapply. And what kid doesnt love a fun color changing sticker?MULTI USE FUNCTION - Perfect for babies, toddlers, kids, and adults. Convenient, small package is perfect for on the go and travel. Easy to store in pockets, diaper bags, and first aid kits. Great for any outdoor activities including the beach, park, picnics, hiking and more. Have fun in the sun without the worry!