Never let your favorite beverage lose its frosty (or piping hot) goodness before you have a chance to fully enjoy it. The YETI Rambler Vacuum-Insulated Lowball Cup is over-engineered with kitchen-grade 18/8 stainless steel construction, meaning it's a tough, hard-wearing personal drink cooler that won't rust or leave a metallic taste. Double-wall vacuum insulation maintains ice twice as long as plastic tumblers, and it works just as well for hot beverages. No Sweat design will never leave a ring on your coffee table. Compatible with Rambler 20-oz. lid (not included).