Say what you want....I prefer a big straw hat. If it's too hot, dunk it in the water and it'll cool your dome for hours. Cheap and effective, breathable, natural fiber, lightweight and ....it has the added bonus of keeping flies out of your ears. Not the buzzing kind, but the fly on the end of your fly line...as it comes zipping by your head after a lousy cast. Spritz it with a little bug juice and the buzzing flies and such will just leave you alone.
Mine cost about $5 at Wally World. They last 2-3 seasons of fishing, gardening, mowing the lawns and just hanging out.
Rg