Connectyle kids bucket sun hat is made of soft, lightweight, breathable and water-repellent nylon fabric, UPF 50+ sun protection hat can block 98% of UVA and UVB rays. Great for playing at the beach or in the backyard, go fishing, traveling, camping, hiking and more. The detachable safety chin strap keep the hat in place, and adjustable hook and loop fastener at center back for custom fit & to grow with baby. Three sizes for your selection. Size S: 50cm (19.7 inches) for Ages 1-2T, Size M: 52cm (20.5 inches) for Ages 2-4T, Size L: 54cm (21.3 inches) for Ages 4-8T.