Originally Posted by BobbyG

I don't know where you are, but here in the high, dry climes of Colorado wearing moisture-wicking activewear creates evaporative cooling while moving, or stationary with wind. It seems counter intuitive to cover up, but at this altitude (~6500 feet) it works for me. I find that un-tucked loose-ish short-sleeve jersey with snug sun-sleeves and a neck-gaiter works well and allows oncoming air to blow up the short sleeve and cool the arm-pits, as well as blow down the neck-line and sometimes up from the waist. I also wear a wicking skull-cap under my helmet. Again, it seems wrong, but once under motion it cools my bald pate.

I also found that caffeine and electrolytes help, and that popping Nuun caffeinated electrolyte tablets in my water bottles helps.

I'm not sure if all this would work in a humid climate, but I wanted to share what works for me.