Last Christmas at one of the fairs, someone was selling hers for $3-$4 each. My friend bought one & loved it. However, I have no idea what was inside it & wondered about that. My friend loved it so much, she asked me to make her a bigger one. I did, but I used the Warm Tater batting & cotton fabric/cotton thread, & just gave it to her.
I was gifted one last year & love mine. I don't know what's in that one, either, although I did ask the giver & did not receive a reply. I use it every morning in the microwave for 3-1/2 minutes & have never had a problem.