I live in California's Sacramento Valley (90-95 all summer) and tour the western states, mostly. Long rides on my 1150RT with Aerostich Roadcrafter get warm. I do the evaporative cooling tricks (wet underclothes, close most vents, etc) but have wondered how fellow riders fare with one of those "cooling vests." If you ride a bike with an effective fairing, your response will be most relevant to me. (I also have a mesh outfit, but I get more ventilation walking down the street in them than I ever feel riding.