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. Easy grip base - taller base ensures a better grip. Double Wall vacuum Insulation. Complies with Prop 65. 3 7/8" L x 3 7/8" W x 8" H