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Thermos brand products offer superior insulation that keeps food at its maximum temperature retention for hours and the 10 ounce FUNtainer food jar is no exception. Thermos vacuum insulation technology virtually eliminates temperature change within the beverage container by creating an airless space between two stainless steel walls. The result is an insulation layer that performs better than any other. A superior insulated container you can depend on to keep your child's food hot or cold for longer. This food jar keeps food cold up to 7 hours and hot for 5 hours.