20 oz. RTIC Water Bottle: Double Wall Vacuum Insulation Maximum temperature retention & insulates hands from the cold, No Sweat Exterior The outside stays dry. No need for a coaster, 18/8 Stainless Steel Strong stainless steel construction, Keeps Ice Longer Holds ice for up to 24 hours, Air Tight Seal Heavy duty lid seal locks in the cold. Dishwasher Safe Keep lids in the top Rack.