The Rambler® 30 oz is the tumbler that gets you through the day. Your morning brew will stay hot or your iced coffee will stay cold - so take your time. Kitchen-grade stainless steel with double-wall vacuum insulation work together protect your drink at all costs. Like the entire Rambler® drinkware family the 30 oz tumbler and MagSlider™ lid are dishwasher safe for easy cleaning. While the magnet on the included MagSlider™ lid adds an additional barrier of protection for keeping drinks contained and preventing heat or cold from escaping, this magnet slider is not leak-proof and will not prevent spills.