USAW Polar Camel Tumbler - Black/Silver - 30 oz. Polar Camel Ringneck Tumbler. Double wall vacuum insulation for maximum heat and cold retention featuring the USA Weightlifting logo laser etched into the powder coated stainless steel. The tumbler has a narrower bottom to fit most standard cup holders and includes clear lid. It is 2X heat and cold resistant compared to normal tumblers. Polar Camels are made from 18/8 gauge stainless steel (18% chromium/8% nickel) - also known as Type 304 Food Grade.