15 oz. Stainless Steel Polar Camel 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 guage stainless steel (18% chromium/8% nickel) - also known as Type 304 Food Grade. This item is print-on-demand. Please allow for an additional 2-3 days for your order to ship. Print-on-demand items are non-returnable except in the case of an item defect.