Ask HN: How do you keep your coffee hot?

no really, how do you keep your coffee hot? special insulated mugs? some fancy material? keep microwaving it? i have a regular porcelain mug and it's not warm for more than 10 minutes.

this problem can't be that hard, and i can't tell if the stuff on google is just a bunch of content farm placed stuff. i would imagine people have been drinking warm beverages for thousands of years.

suggestions?