A go-to for coffee on the go. Any tumbler that's coming along for the ride needs to be tough enough to keep up. Our 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-safe for easy cleaning.