I was wondering if a light colored helmet is cooler in the summer heat than a black one. So I did a little (unscientific) experiment. I put the exact same thermometers under a white helmet and a black helmet. Both had vents closed and visors down. I elevated them so as not to get any ground heat. I then faced them away from the sun so the the visors had no effect (no sun light getting in at all). It was sunny out and 75 degrees. The experiment lasted 2 hours. After 2 hours both helmets were 100 degrees inside. The white one was warm to the touch on outside and the black was very hot to the touch but both were the exact same on the inside. So now when I go to buy a new helmet, I'll go with any color or graphic I want but I will still look for the best ventilation. I'm sure I wasn't the only one with this question, so I hope it helps.