20 oz. Straight-Up Skinny Travel Mug 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 and is BPA and lead free. Made from 18/8 gauge stainless steel (18% chromium/8% nickel) - also known as Type 304 Food Grade.