This tumbler is an excellent choice for daily use to keep 20oz of your favorite beverages hot or cold thanks to the double-wall insulation. Meanwhile, the stainless steel construction provides excellent durability and it's dishwasher safe for added convenience.. .: Materials: stainless steel (body), plastic and rubber (lid). .: One size: 20oz (0.59 l). .: Rounded corners. .: Vacuum insulated steel body with a clear push on lid with a rubber gasket. .: Glossy finish