This is a Nike hat with a brim all the way around. It's reversible, with a plain beige side and a patterned side, so you can enjoy two different looks. It's a casual hat that's easy to put on for walks, travel, and other occasions. Inner diameter: Approximately 20cm to 22cm The mark in the 6th photo is not a stain, but the sheen from ironing. If you're interested in this item, please consider purchasing it.