At a glance, this mug might look like your everyday drinking vessel, but look again. It's loaded with top-to-bottom insulation to keep your coffee hot from the first pour to the last sip. Like the entire Rambler Family, this stackable mug and its lid are dishwasher safe making it easy to clean. And it's a space saver. The built-in grooves on the bottom help it stack perfectly on top of another one