[ Adjustable Size ] The EINSKEY sun hat is adjustable, it is adaptable to head circumferences between 54 and 60 cm. You can easily adjust it to fit your head. [ Anti UV UPF 50+ ] The brim of the hat is 9.5 cm wide, it is wide enough to protect your ears, nose and neck from the sun or harmful rays. Especially your skin is very sensitive! [ Quick Dry ] EINSKEY trekking hat is made of 100% polyester. It is very comfortable, lightweight, pretty and quick drying. This hat is super practical whether you are going gardening, fishing, walking etc. It is recommended to wash your hands below 30 C! [ Good Ventilation ] The adjustable chin strap helps you fix the sun hat on your head so that the hat is not blown away by the wind. The breathable mesh keeps your head ventilated and won't make you sweat. The ventilation system is well thought out. A very nice gift! Folds in four and doesn't take up space in the bag. This is great if you want to take it on a trip in a suitcase or bag. If the hat has wrinkles, it can be repaired by steam ironing. After receiving the hat.