Polyester and Cotton Clasp closure GREAT SUN PROTECTIONToddlers sun hat features highest rated, UPF 50+ sun protection, which blocks up to 98% of UV Rays! Its wide brim and long neck flap help to cover kid's face, ears, back and neck, thus protecting the delicate skin from sun burn better. Absolutely the best summer companion for active little one who loves playing around outside. ADJUSTABLE TO GROW WITH KIDSun hat for kids has two sizes; Size S:3 months-2 years fits head circumference 45-49cm; Size M: 2-6 years fits head circumference 49-54cm. The stretchy headband and rope buckle behind the sunshade hat can adjust the head circumference for a comfort fit. So, this durable hat will definitely grow with your kids for a long time. SMART FEATURES HATKids sun hats come with breakaway clasp chin strap which can ensure the kids safety from choking; while prevent the hat from being blown away on windy days - the safest way to keep sun hat on your babys head. Great for little girls and boys playing at the play ground. Definitely an idea gift to your child, niece, granddaughter or grandson on birthday, summer holiday or festival. HIGH QUALITYThis adorable toddler summer hat is made of skin-friendly, soft, breathable, lightweight, quick-drying nylon fabrics, even if the hat is wet with sweat or light rain, it will dry quickly. The mesh panel on both sides greatly increases air circulation to keep kid's head from being all sweaty, then keep your kids cool and comfortable during the hot summer. PACKABLE & FOLDALEThe waterproof sun hat folds up nice to save space in backpack or bag, while still hold its shape. Perfect for vacation, travelling, beach playing, fishing, hiking, cycling, boating, walking, sightseeing, pook, park, safari, or any other ourdoor actiivies. Your little one will get compliments on them everywhere they go!