30 oz. Stainless Steel Polar Camel Tumblers feature double-wall vacuum insulation with a clear lid. The mug has a narrower bottom to fit most standard cup holders. It is 2X heat & cold resistant compared to normal tumblers. Polar Camels are made from 18/8 gauge stainless steel. You can even add a second side to personalize your tumbler, engraved with name and/or jersey number, for an additional $5.00. Whether you're a student, athlete, parent, grandparent, or teacher, make this tumbler all your own!