100% Polyester Drawstring closure MATERIAL: This ponytail fishing sun hat is made of quick-drying, breathable polyester. UPF 50 + provide you better protection from sunshine and damaging rays. ONE SIZE FITS MOST: Hat Circumference: 21 in - 23 in, Hat Height: 4.33 inch, Brim Length: 3.35 inch, Chin Drawstring Length:12.99 inch. One size is suitable for most women. ADJUSTABLE CHIN DRAWSTRING:Adjustable chin drawstring for fixing the sun hat, especially in windy days. And another drawstring behind the fishing hat is for adjusting the hat circumference to fit your head size. DESIGN: ponytail opening in back is considerate design for women,which is perfect for pulling your messy bun or ponytail. No matter if your hair is thick, thin, curly, wavy, straight, coarse or fine if you wear it up and wear cap, our ponytail caps are for you! Also looks great with braids, sock buns, and other up-dos. PACKABLE & FOLDABLE:Rolled up to small size for easy carry and absolutely save lots of space. It is a perfect sun hat for beach, fishing, pool, park, hiking, camping, travel, hunting, gardening or any outdoor sports and activities.