Any tumbler that’s coming along for the ride needs to be tough enough to keep up. Our Rambler 30oz tumbler 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. MagSlider™ Lid technology means enjoying a hot drink from our Rambler® Tumblers without worrying about spills or splashes on the go. Unlike other closeable drink lids, ours harness the power of magnets (yep, real magnets) for smooth opening and closing, and has a crystal clear lid so you can always see if you’re in need of a top off.