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Thermos vacuum insulation technology locks in temperature to preserve flavor and freshness to keep hot or cold for hours. Perfect for Office, Camping and Outdoors. Fit for most of car cup holder, bike rack and hiking backpack.Drink cup top allows you to enjoy your beverage anywhere. The Thermos cup is made of food grade 304 stainless steel, vacuum inner tank, with heat preservation and cold preservation effect, double electrolyte inner wall. The cup lid is made of polypropylene, ABS resin and silicone gasket. A great way to show you care with a gift that women or men will love. Perfect gift for birthday, Christmas, Anniversary or other celebrations. Double-Wall Construction Vacuum bottles have a double-wall construction, typically made of stainless steel or another insulating material. The inner wall holds the liquid you want to keep hot or cold, while the outer wall provides insulation.Temperature Retention When you fill the vacuum bottle with a hot or cold beverage, it helps maintain the temperature for an extended period. Hot liquids stay hot, and cold liquids stay cold for many hours. The exact duration of temperature retention varies depending on the quality and design of the vacuum bottle.Tight-Sealing Lid Vacuum bottles have a tight-sealing lid to prevent heat exchange with the outside environment. This lid often includes a rubber gasket or silicone seal to create an airtight closure.