100% Polyester Kids sun hat for boys and girls: UPF 50+ protection blocks 98% of UV Rays Featured wide brim and mesh vents for cooling airflow through the crown and back flap Easy adjust sizing, Detachable chinstrap and neck flap, Adjustable drawcord and toggle at back help keep the hat on your kid Lightweight, durable and packable summer bucket sun hat for kids in the mountain, or in the backyard, playing at the beach, outdoor play hat for fishing, safari, travelling, camping, boating 50-54cm/19.7”-21.3” girth fits most children ages 3-7yrs old