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 comfortable grip and ease of transport when pivoting from one daily activity to another. Double Wall Insulation: Keeps beverages cold or hot for hours. Durable: Made of premium 18/8 stainless steel, and comes with a silicone boot to soften landings and enhance stability. Limited Lifetime Warranty & Patent Pending