Great concept. The veskimo is built similar to a heated vest but instead of having a heating element it has small tubing that circulates chilled water from a cooler. It comes with a 12-volt pump you hook to the battery. It works great until the ice melts....and that is the problem. I used it for my commute and froze larger chunks of ice that wouldn't melt as fast and did the same thing in the lunch room freezer at work. That worked fine but really wasn't worth the hassle for a 30 min trip. The bigger problem is on a trip if you stop to fill it up with a bag of ice it only lasts about an hour. Finding bigger blocks of ice while on the road is tough. I think all this solution needs to be a winner is a Yeti style cooler. The other thing I wish they had was a helmet liner utilizing the same concept. I would buy an extra helmet a size larger just to accommodate it.

http://www.veskimo.com/