Microwave bowl cozy

I think these bowls are just genius.  They have been around for a while but are totally new to me. A cousin received one for her birthday and when I saw it  I knew I needed to have one or two so I looked on line and found a free pattern.

You just place your bowl of soup, oatmeal or whatever you wish the cozy, pop the works in the microwave, and when you pull it out you have something to hang onto so you won't burn your hands. How smart is that and why didn't I think of it?