Size: One size fits men's and women's head circumference 22-23"(55-58 cm)perfect size range is 7 1/8-7 3/8, Wide brim 5.89inch / 14cm, keep face and neck from harmful rays.
Sun protection: UPF 50+ sun hat can provides full coverage from the sun's harmful rays. This large brim blocks 99% of UV rays effectively,so you can rest assured that use.