Good ol' H2O has other hot-weather-riding uses, too. When traveling through areas known for severe heat drenching the clothing beneath your jacket or riding suit with water will keep you feeling crisp and refrigerated for quite a while. (Don't ignore the jacket or riding suit, though; exposing lots of skin to the elements by wearing only light clothing while riding will dehydrate your system in no time, and the cooling effects of drenching will last just a fraction of the time they would've if you would've worn overclothing. And then there's the whole "protection" issue....) To maximize the evaporative effect, open the neck, sleeves and vents of your outer garments to keep plenty of air flowing. A large number of vented jackets and suits these days are great heat-beaters whether you use them in drench-mode or not. A wet bandanna rolled up and wrapped around your neck can also be a lifesaver on a hot day. Also, don't forget that light-colored gear absorbs less heat than dark-colored stuff.