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 keeps contents hot 4 hours or iced 20 hours. Electropolished stainless steel doesn't impart or retain flavors. Comes with press-fit Simple Lid (NOT leak-proof).