BREATHABLE BUTTON DESIGN Lunch box for Adult kids has a beautiful Breathable button design and seal ring design and it prevent freshness and its inner surface is very smooth The meal preparation container is also easy to clean THERMAL TECHNOLOGY Thermal Technology The builtin water injection feature makes it easy to heat or cool Simply add hot or cold water into the bottom basin before breakfast lunch or dinner The bottom bowl is made of food grade PP and can also be used to hold fruits or salads The lunch box itself does not have a longterm heat preservation effect it needs to be added with hot water to achieve heat preservation and the heat preservation time is about 2 hour DISHWASHER FREEZER SAFE This Compartments Stainless Steel tray is removable can be cleaned up easily in the dishwasher The plastic bottom box is dishwasher freezer safe BPA free ALL FOOD IN ONE CONTAINER Compartments can fully accommodate the nutritional needs for childrens school lunch you can put cutup Rice Pizza Pratha Sandwiches Pasta Noodle Green Salad Wraps Chips Nuts Dried fruit fruit any meal without gravy WATER INSULATION DESIGN Another useful function is you can pour in some hot water before you eat to heat the food Stainless Steel liner do not put in the mocrowave oven or oven use The Bottom box can be used separately and heated in the microwave oven Please open the cover when heating Note Internal Compartments Not Leak Proof but Main lid is leak proof