Any tumbler that’s coming along for the ride needs to be tough enough to keep up. The Rambler 20 oz is made from durable stainless steel with double-wall vacuum insulation to protect your hot or cold beverage at all costs. Tumbler and lid are dishwasher-safe for easy cleaning. The included MagSlider™ Lid adds an additional barrier of protection for keeping drinks contained and preventing heat or cold from escaping. Layered with an advanced, fingerprint-proof coating tested to the highest level of UV resistance.