Rambler 20 oz Tumbler with Magslider LidAny tumbler that's coming along for the ride needs to be tough enough to keep up. Their fan favorite Rambler 20 oz. Tumbler is made from durable stainless steel with double wall vacuum insulation to protect the temp of your beverage at all costs. Like the entire Rambler Drinkware Family, the 20 oz. Tumbler and MagSlider Lid are dishwasher sate for easy cleaning. While the magnet on the included MagSlider Lid adds an additional barrier of protection