Thermos vacuum insulation technology locks in temperature to preserve flavor and freshness to keep beverages hot for 3 hours or cold for 6Durable 18/8 stainless steel interior and exterior withstand the demands of everyday useFlip-up drink lid makes it easy to enjoy your beverage anywhereSlim body with silicone rubber grip is comfortable to hold and fits most automobile drink holdersTumbler stays cool to the touch with hot liquids and is condensation-free with cold