I bought some coolmax socks thinking how wonderful it will be to have well-ventilated feet. My feet have never felt sweattier, cause the moisture didn't soak up anywhere, it just remained inside my shoes.
This of course has a lot to do with the breathability of the shoes you're wearing, but I'll still stick to natural fibers only from now on. Since nothing is going to stop me from sweating, I'll emphasize on how I feel after I sweat. Same as with deodorants.