Any tumbler that's coming along for the ride needs to be tough enough to keep up. The Yeti Rambler® 20 oz. Is made from durable stainless steel with double-wall vacuum insulation to protect your hot or cold beverage at all costs. Like the entire Rambler family, the 20 oz. Tumbler and its 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 - this magnet component is not leakproof and will not prevent spills. Available in stainless, Duracoat™ colors and seasonal finishes.