12 oz. Stainless Steel Polar Camel Travel Wine/Coffee Mug features  double-wall vacuum insulation with a clear lid.  It is 2X heat & cold resistant compared to a normal travel mug and is BPA and lead free. Polar Camels are made from 18/8 gauge stainless steel (18% chromium/8% nickel_ - also known as Type 304 Food Grade.)