No glass insert
Customers Comment Ira Spiegel of NY
The Thermos brand products are very good. If you preheat the thermos for 5 or 10 minutes with boiling water it should last many hours. A favorite of mine is an older Thermos brand thermos (King Seeley model # 2464S). It keeps coffee piping hot for at least 12 hours and certainly drinkable hot for 18 hours and more.