20 oz. Stainless Steel Polar Camel Travel Mugs feature double-wall, vacuum insulation with a clear, slider lid. They are 2X heat and cold resistant compared to other tumblers. Polar Camels are made from 18/8 gaugestainless steel (18% chromium/8% nickel) also known as type 304 Food Grade The best part? You can add your own custom design to the tumbler! With our laser engraving technology, you can personalize your tumbler with a name, logo, or any design of your choice. Simply email us your design when you place your order and we will take care of the rest. Our engraving process ensures that your design will not fade or wear off, ensuring a long-lasting, high-quality finish.