[Size] - Sun hat circumference: 55.358.5cm(21-23"), hat height: 11.0cm(4.3inch), front brim width: 13.5cm(5.3"), back neck flap length 18cm(7.1 "). Perfect for most women's heads. Drawstring behind the hat is used to adjust the hat circumference to fit your head size. The adjustable chin strap effectively prevents the hat from blowing off in the wind. Closure: drawstring 100% nylon Modern Care Instructions: Hand wash only [Modern Design] - The bucket hat with ponytail hole is specially designed for women with long hair. The back of the sun hat can adjust the circumference of the hat to fit your head size. Freely adjustable chin strap ensures a comfortable fit and effectively prevents the hat from blowing off in the wind. Bring you a cool and beautiful summer.