The bottle body is made of a double-layered stainless steel structure. By creating a vacuum between the outer and inner bottles, heat loss due to convection is prevented, providing excellent heat and cold retention effects. It keeps drinks hot at 70°C or above and cold at 6°C or below for six hours, so you can always refresh yourself at a delicious temperature. In addition, the design makes it difficult for dust to get in even when the lid is removed, so there is no need to open and close the lid every time you drink, and it doesn't get in the way of your work.