When we talk about noon are 2 time to the nearest hour on the road, then it's great if you can take hot food. At the destination you're unanbhängig and not have to do any tedious glass warm. With these expectations I bought these thermos box. And in principle, the expectations are met. Now I have not measured by how many hours the food is cooled. I heat the food before leaving hotter than normal (or let it not so very cool) and fill it directly into the box. After an hour or two when the child is hungry, you can eat the porridge. Nevertheless, there are trigger, namely because of hygiene! As the slurry is poured directly, it is very important that the box is easy to clean. Unfortunately, there is a groove where black plastic and stainless steel meet. Turn around the box to (or has it wrong in his pocket), then you can walk into it as food. The groove may actually only be cleaned with water, with the brush, I can not go in there. And I do not understand why there has to be this groove at all.