Thermos Brand's double wall stainless steel vacuum insulation technology gives maximum temperature retention, hot or cold. Travel mug is cool to the touch for hot liquids, and sweat-proof with cold. Threaded lid with O-ring has slide lock drink through opening. Colby Seal, COLBY, and Est. 1813 (our establishment year) are imprinted on the mug. Small Thermos brand logo on the reverse side. Stainless steel interior, exterior, and lid trim. Keeps liquids hot for 5 hours and cold for 18 hours. 16 ounces.