Maroon 20 oz. Stainless Steel Pilsner 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 tumblers. Tumblers are made from 18/8 gauge stainless steel (18% chromium/ 8% nickel) - also known as Type 304 Food Grade. Hand Wash only.