Anyone know about this? Someone asked about the stuff in another forum yesterday and I did a little research. Here is one link:
From the various sites I looked at, it seems that this stuff doesn't actually feel like you are putting something cool on, but rather, when you go past a certain temperature, it sucks up the excess heat so you feel more comfortable.
As you can see from the link, there are various items. But the thing I would be most interested in would be something to wear inside my helmet since, whenever you stop for a traffic light or something, the heat builds up pretty quick, especially if you have been pushing hard (and I have lots of traffic lights).