Very interesting product! I seem to get too hot and sweaty too readily. Searching around I found a very inexpensive "crown cooler" to put in a hard hat. I wonder if the same theory applies that if you are cold put on a hat as a tremendous amount of heat is lost through the head. So I wonder if a "cool head" would be a significant help? Thoughts? Might buy one and try it, as my head seems to sweat a lot in hot weather, to the point I have to wear a sweat band to keep it out of my eyes...