The warning on electric blankets says not to put anything on top of it. People don't read warnings or follow them, the reason some have dumb sounding warnings on them. Life don't use a hair dryer in the bathtub, someone did that and that is why they have them on all type of warnings. I have used electric blankets and had no problems, cotton batting would have just caught fire. Warnings tell you not to leave the on when not in use, DUH.