Sell me on your favorite Thermos-type mug

There are a million of these things out there, so I want your heart-felt recommendation (brand name is a big help, or a link).

Requirements: I want a mug to drink out of that will keep my tea hot during the work day. I don’t brew in the mug, I brew the tea and then keep it in a larger thermos, and pour it into the mug as needed. Minimum 14 oz, I prefer 16 oz. I prefer the shorter mug style with a handle, rather than the tall thin type. Must be easy to clean (the shorter style also helps with that).

This isn’t for travel, just for the office. So, what do you recommend?