It is hard to beat the Nam Booney hats and I have one.
I also bought a sun hat from Northern Tool that I like very well.
The hat is fully adjustable with a lanyard and has a neck flap.
I really like the neck flap that keeps the sun and bugs out.
UV protection UPF 50+ and treated with premethrin for bug control.
The hat is made by Stetson and called No Fly Zone