Coffee or beer? Both suit the Insulated Tumbler just fine. Made from durable 18/8 food grade stainless steel, the 16oz Insulated Tumbler is designed to last and travel safely where glass can't go. Double-wall vacuum insulation and electropolished stainless steel don't impart or retain flavors. Comes with press-fit Simple Lid (NOT leak-proof). Features Include Shatterproof construction, a Double-wall vacuum-insulated construction keeps contents hot 4 hours, or iced 20 hours and an Electropolished interior doesn't retain or impart flavors.