Love the Gila PRO Airmesh Boonie
"I have tried several different boonie hats over the years. This one is the perfect balance for me. Lightweight and breathable; very comfortable to wear. Unlike some lightweight ones, this hat is firm enough for good sun cover, but soft enough to breath and bend/flex, as well as soft to not create noise. I have about 7. 5 hat size and the XL/XXL is just about right (none too big). Liked enough I had to go buy another."
