Elastic closure MATERIAL: This ponytail fishing sun hat is made of quick-drying, breathable polyester. UPF 50+ excellent sun protection.Provide you better protection from sunshine and damaging rays for face and neck. ONE SIZE FITS MOST: Casual style unisex sun hat, snug and cosy fit. Hat Height: Hat Circumference: 21 in – 23 in, Hat Height: 4.33 inch, Brim Length: 3.35 inch, Chin Drawstring Length:12.99 inch. Elastic buckle behind womens sun hat is for adjusting to fit most adult head sizes. PONYTAIL HOLE DESIGN: ponytail opening in back is considerate design for women,which is perfect for pulling your messy bun or ponytail. The buttons on both sides of bucket hat can give you more different styles. ADJUSTABLE CHIN DRAWSTRING: Adjustable chin drawstring for fixing the sun hat, especially in windy days. Come with mesh side panels and moisture wicking sweat band, greatly makes your head cool and ventilated. PACKABLE & FOLDABLE: Practical and beautiful, foldable caps for women is versatile with multiple looks. Rolled up to small size for easy carry and absolutely save lots of space. It is perfect for beach, fishing, park, hiking, camping, travel or any outdoor sports and activities.