MAMMOTH ROVER 30oz TUMBLER: 30oz insulated cup with lid created to take your favorite beverage on the go; it even fits most cup holders. The double-walled vacuum insulation keeps your beverage at the perfect temperature with no condensation PERFECT FOR ON-THE-GO: Rover tumbler is constructed with 18/8 kitchen grade stainless steel making it durable without leaving a metal flavor. Tumbler has a rubber gasket and lid stopper to prevent spills so you can feel confident taking it anywhere QUALITY INSULATION: Our 30oz tumblers keep hot liquids hot and cold liquids cold due to its double-wall vacuum insulation and crystal clear lid. Now your warm beverage can stay hot for up to 12+ hours and your ice keeps up to 36+ hours SPECS: One 30oz stainless steel Tumbler with crystal clear lid, rubber gasket and stopper, in Dark Blue MAMMOTH COOLERS: The coolest thing since the Ice Age. Molded coolers, soft cooler bags, and tumblers built for the field, the water, the tailgate party, the backyard and more. All backed by a Lifetime Warranty