When it's made by Thermos®, you know performance comes standard. This Stainless KingTM Food Jar is no exception. ThermosTM vacuum insulation technology keeps beverages hot for up to 10 hours, or cold for up to 24. Two 20-oz. microwave-safe containers fit neatly inside to make lunch prep a breeze. Constructed with double-wall stainless steel that'll keep up with your adventurous life.