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Insulated to preserve both cold and heat. Keeps cold for 12 hours and heat for 6 hours if the external temperature is opposite. Explanation of temperature reflection (for example, if the water inside the bottle is cold and the outside temperature is hot, they are considered opposite). Washing instructions: 1- Do not put the cup in the dishwasher. 2- Do not put the cup in the microwave. 3- Wash the cup with a soft dish sponge. 4- Do not scrub the cup with a dish wire. 5- Do not scratch directly on the writing, and do not soak.