I have a tiny head. I used to love visors, but after having a basal cell off of the scalp I'm now wearing hats (most of the time).

I have two white hats that I have been able to wear in the heat. According to the guys at the LRS, most people don't like this hat because it's too shallow. So of course it fits my small head well:

http://www.brooksrunning.com/HVAC-In...=w-access-hats

It's my go-to hat. I'm wearing it in the pictures in my SP 50 thread.

This hat has a larger brim, which is kind of vented. Hard to explain. It fits well, maybe not as well as the HVAC hat but still a keeper. It is a little deeper:

http://www.brooksrunning.com/Printed...=w-access-hats

I throw them both in the washing machine and air dry. They have been through a lot and seem to be holding up well.