The ducks' guts.
If you're in Australia and need a bloody good hat, you just found it. I was dubious at first, but in the few months I've owned this hat it has proven itself time after time. It has become my first choice hat.
The Airflo cooling mesh works very well; you can actually feel the breeze past through if you've worked a bit of a sweat up, Upf50+ sun protection rating, machine washable, handles being wet well and is good in the rain, you can sit on it, fold it up and stuff it in your bag or kit and it knocks back into shape every time, soft and flexible without being weak or flimsy, the darker underside of the brim helps reduce reflected glare well, and the brim is flexible enough to keep the hat on while while your driving...if that's your thing!
If you struggle with the shortcomings of a felt hat in summer, give this fella a crack...