Fit is perfect. I bought the size large—I wear a 7 1/4-7 3/8 fitted hat and the large was a perfect fit for me.
It has an elasticated band inside that is very comfortable and keeps the hat on without the need for any straps.
Gore-Tex kept me perfectly dry in my last round. Also wear it on sunny days. The navy is a dark navy, which is what I preferred esthetically.
I highly recommend!