I found that drinking water every 5 minutes, even just a little will do a lot for the heat. I also use Shot Blocks every 20-30 min. Heat index has been 110+ all week but with a breeze and a wicking type shirt it hasn't been that bad. I will agree with most that if it gets to bothering you wait until it cools down some to start riding again. Otherwise you will hate it and never want to ride again.