I have a HUGE 54" roll of thicker batting given to me. It wonderful however I have no idea if its poly or cotton. I normally use the cotton that is pressed very thin and feels like "felt"? I read many posts on potholders. Some say yes you can use poly one said no, most were yes/no.. so curiosity makes me wonder.. I opened up one of my old potholders and it looks just like this stuff.. its not thermal yet worked fine in my old holder. So how to know? I know the poly/cotton test with a match but think batting.. it might not work the same? ARGH.. I am sure there is an easy answer.