and the Zentek Cooling Mat: http://www.cleanrun.com/index.cfm?fusea
The advantage to the Zentek is that it isnt necessary to add water. The medium Cool Bed takes 3.35 gallons of water comes out to about 26 pounds (if I remember right that a gallon of water is 8 pounds), whereas the Zentek wont.
If you use a cooling product please tell me about it! I tried a cooling collar that you soak in water, and its nice, I just dont like having to toss it after every tournament.