I have seen the inside of a fast cooler. pretty much the same as cool shirt but there is some kind of vented metal mounted around the pvc pipe on the systems that have helmet air also works about as well as the cool shirt cooler with air just ok. As for the cool shirt they have machined plastic that goes through the side wall of the box for the quick disconnect fittings. Hope that helps.
Check out this web sight. This might be the better mouse trap on the helmet air. coolz-u.com