Product Features Double wall vacuum insulation maximum temperature retention & insulates hands from the cold Keeps ice longer holds ice for up to 24 hours 18/8 stainless steel strong stainless steel construction Narrow & tall design fits more cup holders Keeps it hot works great for hot beverages Product Description 30oz. RTIC tumblers are stainless steel, double wall vacuum insulated. Keep your drinks ice cold longer - works great for hot beverages. The shatterproof and crystal clear lid lets you know exactly how much drink you have. Easy to clean and dishwasher safe.usa