Material Composition: 100% polyester; One size fits all; Head circumference: 22.0 - 22.8 inches (56 - 58 cm).Comes with an adjustable strap and is fine adjustable.Facial Smoothing Effect: The brim is large enough to hide your face, making your face smaller than any type of face.It protects against ultraviolet rays, and is recommended to carry one in seasons when the sun is concerned about. UV protection: The polyester material prevents stuffiness and absorbs sweat well.Not only does it protect your face and the back of your neck and ears from sunburn, but it is a necessary hat to prevent sunburn when you go out.(Does not blow off in the wind) Comes with an adjustable chin strap that will not flatten even in strong winds.The entire interior is smooth and smooth mesh, making it very comfortable.(Foldable) It can be folded with a folding button, and it will not spread out in the bag with a string and conveniently put it in your bag.Although it has a long brim, it has a firm texture and good visibility.No need to worry about the front of you.