First of all this hat looks great and is well made and it's adjustable and it fits really well.  The thing is though that if the hat doesn't have actual vents, those tiny little holes do nothing, the fabric must be able to vent moisture which this hat doesn't do . At all.  This hat holds in the heat and humidity.  I took the hat out for a walk in the sun and after about fifteen minutes I took it off and the sweat that accumulated in the hat rolled down my face as if someone poured water on my head. I was quite surprised.  I have never had that experience before with any hat I have owned and I own a lot of hats.  Even a cotton hat will vent some moisture.

Not good for me.  If you live in a dry climate I guess it might be fine but here on the East Coast where we have humidity this hat just doesn't work. One of the reasons is that there are two layers of fabric there.  I'm just going to slice open the inner fabric or maybe just remove it and see if that helps with ventilation.  It's UPF 50 but it's not wearable.