Made of double wall stainless steel, this vacuum insulated tumbler has a snap-on, spill-resistant thumb-slide lid with rubber gasket. It will keep drinks hot or cold for up to 6 hours. Non-slip bottom keeps it in place. Due to the vacuum insulation technology, capacity is 18 oz. with the lid on. This stainless steel tumbler meets FDA requirements and is BPA free. Hand washing is recommended.