The insulated coffee thermos is made with vacuum insulation technology, which ensures that hot or cold beverages remain insulated for a very long time.Long-lasting ice cold in summer and long-lasting heat retention in winter.With large opening and large water output, if you want to use it for iced coffee, iced tea or juice, you can also easily put ice cubes into the coffee maker. Vacuum glass liner, food grade silicone seal, excellent heat preservation