15 oz. Stainless Steel Polar Camel Mugs feature doubl-wall, vacuum insulation with a clear, slider lid. (Compare style and quality to "Yeti"-type).  They are 2X heat and cold resistant compared to other tumblers. Polar Camels are made from 18/8 gauge stainless steel (18% chromium/8% nickel) - also known as Type 304 Food Grade.  See options here, but more colors and YOUR CUSTOM DESIGN are available as well!