I wanted a cute hat that would fold up for travel.  I wear a small/medium and was prepared for this hat to be too big, because all hats are too big on me. To my surprise they have two small cords inside that allow you to adjust the fit!!!  It was easy to make it small enough to fit me perfectly.  The chin strap was also a must for me and it was tested many times on my trip to Washington DC.  If you don't need the chin straps, they are removable!  They thought of everything, right?  The other thing I needed was a wide enough brim to provide protection for my face and neck--done and done!  Then you consider the price and style and it just keeps getting better.  I ordered navy and love the color! The only hard part is deciding what color to order for my next one!  You will love this hat!