Arctic Ice Alaskan Series panels are powered by a new phase change material and designed to keep food and beverages refrigerator-fresh. The plant derived active ingredient is non-toxic. Maintains a refrigerator temperature of 34 to 40 degree F in cooler. Flat panels store easily and when used in combination with ice can maintain ice in coolers up to 50% longer. Use same weight of Alaskan Series as bagged ice for better results.