For all the folks with hardhat liners: I sweat. A LOT! One of the best products out there for this is called Terry Toppers. There are several manufacturers using similar names. It's a terry cloth sweatband that fits around the vinyl cr@p on the front of the liner. If you have problems with the sweatband after a couple of hours trooping, give these a shot.
---------------
I liked this idea, so I gave it a shot. In a ddition to the traps in the back, I also did the teardrops. I have done 2 troops, both inside and outside with minimal fogging and no fans installed. What do y'all think?
Yeah, I know the masking tape adds a lot to the internal look!
I found some nice and bright white vinyl sheet at Jo-ann fabrics. Makes it really easy to install and change around is you need to. Very comfortable too.