Any tumbler that's coming along for the ride needs to be tough enough to keep up. Our Rambler® 20oz. is made from stainless steel with double-wall vacuum insulation to protect your hot or cold beverage at all costs. No freezing mornings or sweltering days will compromise your drink. Comes with the MagSlider lid and is available in stainless and DuraCoat colors. Complies with Prop 65.