Received "GERMAN DESIGN AWARD WINNER 2016", a German Good Design Award.The high design quality that has been evaluated in the world surpasses that of aluminum SIGG.High heat retention-(1) A vacuum double structure made of stainless steel that enhances heat retention.(2) The ""zirconium"" contained in the thermosig body combines with the oxygen and moisture that are slightly left in the vacuum layer to enhance the effect of the vacuum that does not let the heat and cold air inside the container escape to the outside.(3) By applying "copper coating" on the inside of the vacuum surface, it boasts even higher heat reflection inside.In this way, it is a highly functional bottle made with attention to detail.Heat retention effect: 63C (6 hours)