I have a bit big head circumference (60cm = 7 1/2?) and normally have trouble finding a baseball type cap that would fit and this one does while still fitting good and comfortable, although on one of the largest setting. The closure is velcro and easy to adjust. The water repelling properties are fantastic so far, I got it when I learned that it's going to rain on my 1st half marathon race day, and I wore this cap all the way and it kept my head, glasses and face dry. Because the material is Omni-tech, it's very breathable. The vision was a tiny bit obscured by the bill ends but nothing that would make it a poor choice for a rainy day outdoors. All in all a great product, I hope to get some wear from it. Oh, and I'm a female runner and this cap is labeled as unisex on Columbia's website, and it is quite flattering, the description should be corrected.