The Rambler 30 oz. is the tumbler that gets you through the day. Your morningbrew 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 protectyour drink at all costs. Like the entire Rambler Drinkware Family, the 30 oz.Tumbler and MagSlider Lid are dishwasher-safe for easy cleaning. While themagnet on the included MagSlider Lid adds an additional barrier of protectionfor keeping drinks contained and preventing heat or cold from escaping, thismagnet slider is not leakproof and will not prevent spills.