The fan-favourite Rambler 20 oz - tough enough to keep up along the ride. This tumbler is made from durable stainless steel with double-wall vacuum insulation to protect the temp of your beverage at all costs. Like the entire Rambler Drinkware Family, the 20 oz. Tumbler and MagSlider Lid are dishwasher-safe for easy cleaning. While the magnet on the MagSlider Lid adds an extra 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.18/8 Stainless steelDouble-wall vacuum insulatedSplash resistantDishwasher safeCupholder compatibleMagnets - easy to open and closeCapacity: 20oz/591ml