30oz. RTIC Tumblers are stainless steel, double wall vacuum insulated. Keeps your drinks ice cold longer - works great for hot beverages. The crystal clear lid lets you know exactly how much drink you have. Easy to clean. No Sweat Exterior - the outside stays dry. No need for a coaster. Keeps ice longer - holds ice for up to 24 hours. Air tight seal - Heavy duty lid seal locks in the cold. Air tight seal - Heavy duty lid seal locks in the cold. Easy grip base - taller base ensures a better grip.  Double Wall vacuum Insulation  Keeps cold for up to 60 hours. Keeps hot up to 12 hours.