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insulated tumbler has a double-walled design with a vacuum layer between the walls. We put an additional layer of copper plating on the outside of the inner flask to reflect heat and minimize the temperature change. All these features help your drink stay hot or cold for hours.Leak-proof and spill-proof design allows you to take the tumbler anywhere.The slim coffee mug fits easily in hands and in most car, bicycle, or scooter cup holders.Preheat inner space with hot water for keeping the temperature longer.The liquid will stay cold longer if you put some ice cubes in it.Don’t overfill the tumbler to avoid scalds when opening the lid.Do not fill with dairy products or baby food due to the risk of bacterial growth.Not suitable for carbonated drinks.Not for use on a stove, in a microwave, dishwasher or freezer.TO PREVENT SPILLAGE PLEASE ENSURE THE LATCH OF THE LID IS SECURELY FASTENED IN THE GROOVE.