Connectyle Kids neck flap uv sun hat is made of breathable polyester, UPF 50+ protection blocks 98% of UVA and UVB Rays. Hat Circumference: 48cm-53cm/18.9"-20.9", fits most children ages 2-6. Elastic string with buckle at back for adjustable fit,detachable chin straps holds hat in place. 7cm wide brim and big floppy back will help shield your kids skin and offers extra protection. The mesh side vents for superior airflow and internal moisture wicking sweatband for comfortable fit, Hand Wash.