Stainless steel 16 oz thermos vacuum insulation keeps beverages hot for 12 hours or cold for 24, preserves flavor and freshness, 5 year warranty on heat retention. Perfect for coffee or tea. Durable and sanitary 18/8 stainless steel interior and exterior withstand the demands of everyday use. BPA free flip-top lid with built-in sipping design, button activated and additional clasp for secure travel.