Thermos 18 Ounce Vacuum Insulated Stainless Steel Tumbler, Stainless Steel Thermos vacuum insulation technology locks in temperature to preserve flavor and freshness to keep beverages hot for 4 hours or cold for 8 Durable 18/8 stainless steel interior and exterior withstand the demands of everyday use Flip-up drink lid makes it easy to enjoy your beverage anywhere Slim body with silicone rubber grip is comfortable to hold and fits most automobile drink holders Tumbler stays cool to the touch with hot liquids and is condensation-free with cold