The Rambler 591 ml / 20 oz Tumbler must be able to withstand anything you throw its way. Made of tough stainless steel and equipped with double-wall vacuum insulation, it ensures the utmost protection for your hot or cold beverage. Both the tumbler and its lid are dishwasher-safe, just like the entire Rambler Family, making for effortless cleaning. While the MagSlider Lid's magnet offers an extra layer of protection against leaks and heat or cold loss, please note that it is not entirely leakproof. Choose from Stainless, Duracoat colors, and Seasonal finishes.