16 oz. Fluted Travel Tumbler has vacuum sealed double wall insulation which improves thermal efficiency; keeps beverage hot for 4 hours or cold for 11 hours.; Insulated lid has one hand operation for easy drinking; the innovative liquid lock technology creates a leak-proof seal when lid is closed; Tumbler fits under most single serve brewers and fits in most car cup holders; lid disassembles for easy cleaning; perfect for use at home or on-the-go; BPA-free materials; stainless steel tumbler is durable and will not retain odour or flavour of beverages; Dishwasher safe, but hand washing will extend life of tumbler and lid; do not microwave