The YETI Rambler 30 oz Tumbler is designed to get you through the day. Your morning brew will stay hot or your iced coffee will stay cold, so take your time. Crafted from kitchen-grade stainless steel with double-wall vacuum insulation that 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. Please note that the magnet slider is not leakproof and will not prevent spills.