About this item Elastic closure Comfortable to wear: elastic headband design fits nearly all head sizes easily and very comfortable to wear Practical umbrella hat: great for protecting your head from rain and string sunny, keeps you head dry on rainy days or keeping it shaded on sunny days Quality material: they are made of quality waterproof cloth, stylish and functional, practical design keeps you dry while keeping your hands free Measurement: the diameter (the state of open) of each umbrella hat