Multi-Use Lid: Featuring two interchangeable lid pieces, you can choose your preferred sipping method - straw or chug - and easily swap out the sipping component within the lid at any time.Functional: Ergonomic handle design allows for a comfortable grip, making it easy to carry on-the-go.Double Wall Insulation: Keeps beverages hot or cold for hours.Durable: Includes silicone boot to soften landings and enhance stability. Pat/Pat Pend.