Not only do our tumblers feature our top-of-the-line, highest quality stainless steel design, but also offer a lid that virtually leak-proof and is super convenient to use. Versatile to use with straws or just to ship, our patent-pending lid has a control-flow design. Simply leave the middle hole open for a fast pour or close it for a slow pour. Lock the black lid back in place while sipping. If you prefer a straw, you can place in the side hole for drinking at a convenient angle. Find a tumbler that fits your lifestyle.