The Rambler® 30 oz. Tumbler is designed to keep your favorite beverage insulated and enjoyable throughout the day. Made from kitchen-grade stainless steel with double-wall vacuum insulation, your drink will be protected against all odds. Plus, the 30 oz. Tumbler and the included MagSlider™ Lid are dishwasher-safe, for easy cleaning. The MagSlider™ Lid contains a magnet for added protection and containment, though it is not leakproof and will not prevent spills.