The Mug Hug, aside from having a pretty cute name, serves a useful purpose: it covers your coffee cup so your delicious latte doesn't spill. The lid resembles those with which everyone is so familiar. Just like a Starbucks or McDonald's lid, it has a raised circular surface and a small opening.
The Mug Hug is made of silicone, so it can stretch to fit most normal-sized mugs. If you take your coffee to work in the morning (but don't have a travel mug...) then the Mug Hug would be very functional.