I read some reviews that said the same thing about these types of cooling systems in humid climates. Since I live in an extremely humid climate, I decided to go a different route entirely. I ordered a waist belt with two flasks. I figure I can use one for drinking as it gets hotter and I attempt longer runs, and the other for pouring over my head to help a little with the heat.

Here's the one I got: http://www.amazon.com/Nathan-10-Ounc...0973855&sr=8-1

Thanks for the all the feedback, though!