Thermos vacuum insulation technology for maximum temperature retention, hot and cold. Durable stainless steel interior and exterior. Lid made with BPA free Eastman Tritan copolyester to resist stains and provides durability. Smooth flow design helps control the flow of warm liquids. Dishwasher durable, top rack recommended. Keeps hot for 12 hours. Keeps cold for 24 hours. 16 oz