This sun hat is made with high-quality lightweight water resistant nylon for quick drying, with mesh panels and two-side air vent, letting your head stay ventilated and cool on summer days. Hat size is available from 22 to 23.6 inches and rear adjustable elastic drawstring design, one size fits most adults head size. The adjustable chin strap with unti-drop button can keep this hat stable in a strong windy weather. UPF 50 large brim block out 98% of harmful UVA and UVB rays, it is a perfect hat for safari, fishing, hiking, camping, travel, hunting, gardening or any outdoor activities. Available in several colors and can be customized with an logo.