I love the design of this mug! Great for travel, fits perfectly in both of my cars cup holders! I'll be ordering more for my co-workers since they now have cup envy!

They are double walled and insulated so they keep liquids at the temperature you want them (either hot or cold). I use mine as coffee mugs and I love them. They are amazing at keeping my coffee piping hot! The stainless steel on the outside though does not get hot because they are double insulated. There is a convenient handle though so you can carry it by the handle as well.
There is a flip top opening that you can use to drink from. You just flip it up. There is also a catch on the other side of the lid so that way the lid doesn't crash down on your face while you are drinking. It has a great rubber seal on it so you don’t spill coffee or any other drink all over yourself when you are drinking from it.