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It states that it is cotton batting; but you have to really research to find that it is punched with polymer fibers so it then becomes 87.5% cotton and 12.5% polymer fibers. I was looking for batting that was 100% cotton. I made several microwave cozies with it before I found out (after a lot of research) that it was NOT microwave safe. It is also a much thinner batting that others that I have bought. I would not buy it again. It was a waste of my money.