Coffee or beer? Both suit the Insulated Tumbler just fine. Made from durable 18/8 food grade stainless steel, the 20oz 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). We are very pleased with how snazzy these look and we know you'll love them too.