20 oz. Stainless Steel Polar Camel Travel Mug (with Silicone Grip) 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 travel mug.  Polar Camels are made from 18/8 gauge stainless steel (18% chromium/8% nickel)