Food box in borosilikat glass and patented lid You can easily heat home-made meals with the lunchbox so that they are as good as when they were freshly cooked. The lid is designed with a technology that prevents all moisture, which makes it heat the food much tastier. Glass can withstand temperature fluctuations of up to 220°C without breaking The food box can withstand extreme temperatures from -40°C to 300°C. Make sure to pick this off in time. Both the lunch box and the lid can withstand dishwasher.