Originally Posted by
ypsetihw
whatever longsleeve you wear, get it wet! like seriously, drench it before you put it on. as it evaporates it will cool you. I do this when it's REALLY hot out, even with short sleeve jerseys. anything synthetic will dry relatively fast and you'll be surprised at how cool you feel.
On the hottest days I squirt myself with my water bottle when stopped at lights. A shot or two in the helmet vents too. I notice that I'm fine as long as I'm rolling, but stop at a light in the hot sun and that's when I start to really feel the effects of the heat.
Interesting read on topic:
Summer Science: Clothes Keep You Cool, More Or Less : NPR
"Unfortunately sunscreen sometimes affects sweating," Havenith said. "So the sunscreen then might reduce the amount of sweat evaporation or the amount of sweat production.
Makes sense to me, and agrees with my experience.