Safety Hot Food Jar -- 304 stainless steel, BPA free, no PVC, food grade material, please feel free to order it without any worry. High Quality Insulation Technology -- This hot food jar is designed with double wall vacuum stainless steel, great copper coated insulation technology, special heat insulation foam, which help you keep food hot or cold for a long time in Winter or Summer. Long Time Insulation -- Important Tips: Please pour in boiling & cold water to preheat & pre-cool for about 10 minutes before packing food into this hot cold food container. Keeps liquids hot & cold for 12 hours, keeps meat food hot more than 4 hours. Package may vary. Please enjoy your healthy delicious food drink at school office or outside. Wide Mouth -- The 2.7 inch wide mouth is easy for eating directly from this stainless steel containers, also easy for filling food into and cleaning. Wide Application -- This insulated stainless steel lunch containers is great for kids girls boys adult women, at school picnic camping and outdoors, children would enjoy their healthy delicious food that prepared by warm families. At office or outdoors, adult also can enjoy hot lunch momentarily. In summer, this insulated food container also can keep cold food cold for a long time. Also a great necessity gift for kids in back to school season.