I've been using the thicker baby blankets for batting in potholders (Alica's old ones, and Goodwill finds). They are like really thick flannel. They are 100% cotton (have to check labels though not all of them are) and flame retardent, since they are intended for children they pretty much have to be (as per gov't guidelines, if they are to be believed). They are a nice thickness, not too thick..not too thin, and you can get a ton of pot holders out of a crib size cover.