Polar Camel 20 oz. Vacuum Insulated Tumbler w/Clear Lid and slide top lid with WA3% logo 20 oz. Stainless Steel Polar Camel Tumblers features 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 a normal tumblers. Polar Camels are made from 18/8 guage stainless steel (18% chromium/8% nickel) - also known as Type 304 Food Grade. Graphic is laser engraved - providing a permanent marking Double-wall vacuum insulation with a narrower bottom to fit most cup holders. Not recommended for dishwashers, hand wash only. Seamless construction so there is no leak point. Hole on lid is big enough for a straw. Polar Camels are made from 18/8 guage stainless steel (18% chromium/8% nickel) - also known as Type 304 Food Grade.