I was gifted a microwave cozy & it was a while before I started using it for my morning oatmeal. Now I can't do without it! I've been wanting to make some for Christmas gifts, but when I inquired about what the maker of mine used for batting, she didn't reply. In the meantime, a friend of mine went to a craft show before Christmas & bought one for herself & one to give her mom. She loves hers, but wanted a bigger one. So I bought the batting for microwaving & followed directions for making it, & I discovered that the bowl is thicker than the one I was given, & also thicker than the one my friend bought at the craft show. However, she loves it & I know hers won't catch fire -- I'm just not sure about the others!
I would not dare make these cozies with any other batting. I still don't know how the others were made -- did they use just one piece of batting? I used two.