Alaskan series cooler panels freeze at 33.8 F and can EFFICIENTLY keep food or drinks cold without risk of freezing and is reusable for years. The active ingredients are non-toxic, biodegradable and housed in a rugged container designed to provide maximum surface area to increase the efficiency at which they cool. Store in the freezer until needed and return to the freezer after use. Alaskan series cooler panels will freeze in 6-8 hours in any freezer. The cooler panels can be used in combination with ice to extend ice life up to 50 percent. Panels are top rack dishwasher safe. The ice size is large.