One Size - Adjustable Circumference 21-23 Inches. Hat Height 4.33 inch, Wide Brim 3.35 inch. Adjustable Chin Strap 12.99 inch. | UPF 50 Sun UV Protection - Large Wide Brim Design Helps Protect Eyes and Face From Harmful UV Sun Rays. The Tight Weave Construction with UV Absorbent Yarns Block The Full Spectrum of Harmful UV rays. | Cooling & Ventilation - Cool Mesh Inside, Quick Dry Cloth Out Surface. Ponytail Hole Design More Comfortable for Womens. | Packable - Foldable Hats Could Rolling Up to be a Small Size within Your Pocket. Very Easy to Carry, Suitable for Travel, Fishing, Beach Holiday, Park, Hiking, Camping, Hunting, Gardening or any Outdoor Sports and Activities. | Adjustable - Adjustable Buckle at the Back of Hat for Circumference Size. Adjustable Chin Drawstring Strap for Fixing Hat, Especially in Windy Days.