Connectyle womens neck flap sun hat is made of nylon fabric, cool and comfortable. And it is 50+ UPF for complete UV ray protection of your face, ears, and neck.The neck flap of the hat measures 9.0" in length and 15.9"in width, providing exellent coverage for the neck.The neck flap is detachable and can be easily stored in a hidden pocket on the side of the hat, making it convenient for use in different occasions. One size fits most adult head sizes between 21.7"-22.9"/55-58 CM. The chin strap holds hat in place on windy days, elastic drawcord with toggle at back for adjustability.