Thermos vacuum insulation technology locks in temperature to preserve flavor and freshness to keep beverages hot for 18 hours or cold for 24 Durable 18/8 stainless steel interior and exterior withstand the demands of everyday use Convenient twist and pour stopper makes serving simple Built-in stainless steel cup lets you enjoy your beverage anywhere Light and compact design for effortless transport and storage; stays cool to the touch with hot liquids and is condensation-free with cold