Made with 18/8 food grade stainless steel outer shell with plastic liner, the 20oz. Marselle Tumbler is the top standard for a durability, heavy duty, vacuum insulated tumbler. The vacuum insulation keeps your coffee or drinks hot or cold for hours. The tapered bottom fits cup holders, and it comes with a clear plastic push-on lid with sliding drink opening. This tumbler will fulfill your entire day of hydration needs.