Well ventilated Riding Hats?

I like the Charles Owen skulls, they have a good level of ventilation. My last Pro II was great, and I'm thinking of the 4* next.
 
I used to have a champion vented hat and it kept the top of my head cool but now I have the gatehouse HS1 and it is sooo much better.
 
Ive just bought a casco mistrall helmet (£75 using H&H christmas deal), it has the best ventilation out of any hat I've had! When hacking the other day in breezy weather I could actually feel the air circulating round my hair under helmet when walking into the wind. Very lightweight too, I'm pretty pleased with it :). I also have a gatehouse conquest that has good ventilation, but casco is better.
 
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