i play. Flap Sun Protection Hat | All-day sun protection for baby's head, neck, & eyes | Adjustable size, UPF 50+ protection, Quick-dry, Comfortable wicking liner 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.