tomlff Penguin Stainless Steel Vacuum Thermos Travel Mug Tea Water Bottle Coffee Flask Thermos vacuum insulation technology locks in temperature to preserve flavor and freshness to keep beverages hot for 8 hours or cold for 12 hours Durable 18/8 stainless steel interior and exterior withstand the demands of everyday use Drink lid opens with push button ease and locks closed for carefree travel Bottle stays cool to the touch with hot liquids and is condensation-free with cold Light and compact design for effortless transport and storage and fits most automobile drink holders