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: Cupholder-friendly with an ergonomic handle design, allowing for a comfortable grip and ease of transport.Double Wall Insulation: Keeps beverages hot or cold for hours.Durable: Includes a silicone boot to soften landings and enhance stability. Pat/Pat Pend.