http://www.arcticheatusa.com/cooling_ve ... gvest.html
The vest is easy to use and can be activated anywhere by simply submerging the cooling vest into water for 15 minutes so that the crystals in the pocket swell into gel form.
Once activated the vest can be placed in the refrigerator or freezer. The vest can also be placed inside the resealable bag/satchel it was purchased in and put on ice or in an ice slurry. The length of cooling time is subject to outside temperature and body heat considerations.
As a guide if soaked in an ice water / slurry for 5-10 minutes the vest will stay cold for 30-60 minutes. If frozen for two hours or longer it will stay cold for 1-2 hours.
$200 for 1-2 hours of use per "freeze"?