Ceramic-Lined Interior: Preserves the integrity of your coffee's flavor.Double Wall Vacuum Insulated: Keeps beverages hot or cold for hours.100% Leak-Proof: 360° push-button lid is drinkable from any angle and is leak-proof in the closed position.Cupholder-Friendly: The Voyager’s unique shape makes it the perfect reusable travel mug, as it fits most car cupholders.Silicone Grip Base: To soften contact and enhance stability.Durable: Made of premium 18/8 stainless steel *Not for use with carbonated liquids Pat/Pat Pend.