By far and away the best travel mug for keeping coffee hot for a long time, all day in fact, is the Stainless King mugs made by Thermos.
Thermos has been making the Stainless King line of travel mugs for a few years now. I was first introduced to this mug in 2011 when I bumped into it at target. At that time it had already been on the market for a good long while.
The mugs come in a few different styles. The traditional tumbler style is the most popular but you can get them with handles and in beverage bottle form too. They also can be bought in a couple different main colors.
Will it keep your coffee hot longer than all the other mugs out there? In short, yes it will. The mug will keep coffee warm all the way until the next day if you forget it on your counter for that long. Under normal slow-drinking conditions this mug will easily keep your coffee hotter than all the others by hours and should easily last you for a full working day.
The best alternatives to the Stainless King can be found below. Some are less expensive and although they will keep your drinks hot for a really long time they won’t be quite as good.
Contigo AUTOSEAL West Loop Stainless Steel 20-Ounce Travel Mug with Easy-Clean Lid, Stainless SteelZojirushi SM-KHE48AG Stainless Steel Mug, 16-Ounce, Smoky BlueThermos 16-Ounce Vacuum-Insulated Travel Tumbler, Stainless SteelOXO Good Grips LiquiSeal Travel Mug, Stainless SteelTrudeau Board Room 16-Ounce Travel Mug, Black
Make sure to see our page on top coffee travel mugs for more high end options.