The outside of the thermos is coated with a special red, matt, non-slip paint to prevent accidental dropping when held in gloves. The thermos is made to be as easy to handle as possible. The inner layer of the thermos is coated with a special thin layer that improves the insulating properties, at the same time acting antibacterially. For maximum use of the thermos we recommend before use: - if you want to put hot food in the thermos , before use, heat it with warm water for about 4 minutes, then pour out the water and put the food - do the same for cold drinks or food (pour cold water / 4 min.) A great advantage of the thermos is the safety valve. When pressed, it equalizes the pressure inside the thermos, eliminating the risk of scalding by hot steam when opening or accidental "explosion" during transport. The cap also serves as a food bowl.