It keeps the drink at a specific temperature indefinitely.
With an insulated mug, you aren't putting more heat into the drink but just trying to keep it for longer. In my opinion, insulation works great for cold drinks (I use a giant insulated cup for my cold drinks) but not so much for warm drinks.
With an insulated mug, you aren't putting more heat into the drink but just trying to keep it for longer. In my opinion, insulation works great for cold drinks (I use a giant insulated cup for my cold drinks) but not so much for warm drinks.