QUICK-DRYING MATERIAL: Made of waterproof polyester fabric, easy to clean, breathable, quick-drying. Waterproof material ideal for wearing in outdoors, especially in rainy days, Water repellent material hat could prevent rainwater from seeping into your head.An internal sweatband keeps sweat out of your eyes and face,keep you cool and comfortable during the whole summer. SUN PROTECTION: This sun hats for women provides UPF 50+ UV protection from sun rays by covering your eyes, face and neck with neck flap and wide brim, helps you stay cool as you enjoy your outdoor activities in the sun. Ponytail opening in back is considerate design for women. ONE SIZE FIT MOST: Women sun hat size is suitable for head circumference 21.6″-23.6″.