Material: This sun hat is made of high-quality waterproof polyester. The mesh inner design keeps your head cool and ventilated. 50+UPF Protection: The wide brim protects your face and neck from the sun, providing solid protection from harmful rays. Roll-up: The brim of the outdoor boonie bucket hat can be rolled up with a button to change to another wearing style. This design offers a casual and British style. Free Size: The adjustable chin strap allows the hat to fit most adult head sizes. 56-58cm Uses: Perfect gift for those who love fishing, hiking, travel camping, boating, gardening, and any outdoor activities.