The Bushman is right around a 4" brim.
I find oilskin hats to be the same as wearing a sauna on my head....felt is much cooler for me.
For a canvas hat nothing beats a Tilley. I have a half dozen Filson tin and shelter cloth hats....never wear any of them as they are just too hot and not comfortable at all.
Also I do not consider a Boonie to be a hat.
