Thermos™ vacuum insulation technology for maximum temperature retention, hot or cold. Keeps hot for 24 hours and cold for 24 hours. Durable stainless steel interior and exterior. Cool to the touch with hot liquids, sweat-proof with cold. Insulated stainless steel serving cup. 50 year guarantee.  Dimensions (LxWxH): 9.4 x 10.5 x 31.0cm.