this is from another site:
"Again, I will refer to "Proficient Motorcycling" which will tell you..sic
Above 98.6 (your body temp) the fast moving air on a bike emulates a "convection oven" and actually pump more heat into your body than you can get rid of by sweating. In dry environments,at leat, you simply cannot sweat fast enough to shed heat. A jacket will keep some of the perspiration on your skin, where it helps cooling your body."
This is seems true, on my commute home yesterday after work (just like everyday), i was wearing a mesh jacket, over pants, motorcycle boots, gloves and helmet... it was sunny and about 97 degrees outside. Although I wasn't cool, i wasn't melting and about to pass out. Earlier in the day, i was out in the sun for about 3 hours, t-shirt and shorts... i was dying and felt a little weak at times (another story, i wasn't hydrated well enough).. yeah apples and oranges, but maybe if it will get some of your goobs to think a little more about this, maybe i'm helping someone.. who knows.