The Rambler 30 oz. is the tumbler that gets you through the day. Your morning brew stays hot, and your iced coffee stays col - so take your time. Kitchen-grade stainless steel with double-wall vacuum insulation insulation will protect your drink at all costs. Like the entire rambler family. The 30 oz. Tumbler and whichever lid you put on it are dishwasher safe for easy cleaning. While the magnet on the included magslider lid ads an additional barrier of protection for keeping drinks contained and preventing heat or cold from escaping, please note - this magnet component is not leakproof and will not prevent spills.