I run a palm straw hat - had it for years. when it's hot dunk it, when it's raining it seals up - sort-of. Anyways most of the rain runs off. Regular straw falls apart, palm lasts much longer. I got mine, like 10 years ago at Targhee fest. I see them every year at various outdoor markets - they're usually 40-50 bucks.
The Riverz look pretty sweet.... Not sure about $95 bucks for a hat but I like the idea of the adjustable band and sizing.
My son's river hat (and my wife's tucked up under the bimini)