[THE MOST EFFECTIVE WAY TO STAY PROTECTED]: Our stickers for Sunscreen are the easiest and most effective way to make sure your skin stays protected from harmful UV rays, all day long. Each pack contains 28pcs stickers, providing an ample supply for long term use. [HOW IT WORKS]: Flower stickers will darken to purple based on the UV exposure. Apply your sun protection cream 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! Stickers are made with safe hypoallergenic adhesive. They have a UV-sensitive layer that reacts to sun rays and turns purple on UV exposure. Waterproof to stay all day. [LASTS UP TO 12 HOURS]: Our UV stickers last up to 12 hours. The color change will cycle ALL day with each sunscreen reapplication. It means you can enjoy your time outside without having to constantly reapply sunscreen, you don't need to use another sticker each time you reapply. [PERFECT FOR THE WHOLE FAMILY]: 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!