The Rambler® 20oz. and 30oz. Tumblers are built tough to keep your drinks at the perfect temperature all day. Made from kitchen-grade stainless steel with double-wall vacuum insulation, they keep hot drinks hot and cold drinks cold wherever you go. Both sizes are dishwasher-safe and include a MagSlider™ Lid that adds an extra barrier to help retain temperature and reduce splashes. Choose the 20oz. for easy portability or the 30oz. when you need more capacity to power through the day.