UPF 50+ Sun Protection Flap Hat by Iplay - Yellow - 2-4 Years Machine washable and dryable. Special sun protective fabric offers excellent sun protection. Ties under chin. Lightweight UPF 50+ Fabric Flap hats are baseball hats with a longer neck flap for great sun protection. Outside of hat is microfiber, the inside has a wickaway lining to keep your little one cool and dry.