I've discovered over the last few very sunny and hot days that my Sundays Afternoon Adventure hat, is not only very good at protecting, my face, ears, and head from the sun but the peak has the effect of directing cool air onto my eyebrows area, which I find very nice. Not a lot but enough for me to notice and appreciate. I'm tempted to convince myself that the curve of the peak is acting like an 'aircraft wing' and compressing the airflow in a particular direction?