Originally Posted by Wuwei
One thing everyone should try is a white helmet, which I think helps a lot.
Many years ago a motorcycle magazine did a comprehensive test and found that the color of a helmet had no measurable effect on the inside temperature.
My guess is that the shock-absorbing foam lining makes an excellent insulator.
However, for safety, a white helmet was found to be the color most often seen by other drivers. Perhaps this is because moto-cops wear white helmets?