The biggest feature of a thermos cup suitable for heat preservation and cold preservation is that it can keep cold things in a cold state (cold preservation) and hot things in a hot state (heat preservation). Its principle is that there is a vacuum between the outer layer and the inner layer of the stainless steel liner, and the vacuum layer reduces the heat conduction efficiency to prevent heat loss. In the cold winter, if you use ordinary cups to hold water, the heat will dissipate quickly, which naturally reduces people's thirst for water. A thermos cup with reasonable design and excellent quality can control the temperature change range at about 65438 05℃ within six hours, and meet the demand of human body for water and temperature. If in the hot summer, people begin to prefer the refreshing feeling of ice, you can add ice cubes to the thermos cup and enjoy the fun of ice anytime and anywhere.