I cannot even tell you how magical this rash-guard is. It will be the best swimsuit purchase you have ever made. I love a good rash-guard to protect those sweet babies skin. This rash-guard is 88% Nylon, 12% Spandex with UPF 50+ Sun Protection. It is chlorine and saltwater resistant, lightweight and air-dries quickly. There is a zipper closure on back, and a three snap closure at inseam for easy diaper change. The detailed decorative bows at side seams are the most precious addition to this suit along with the iridescent sleeves and sparkle throughout. We love that you can machine wash this puppy! And if baby girl has a big sister check out the Prancing Unicorn Tankini Set!