Disagreeing here!!!
The Warm Co isn't being deceptive. They list on every label/bag what is in it. The package sitting by my table states that it is: 87.5 percent cotton and 12.5 percent polypropylene. I've yet to see it labeled 100% cotton.
They can call it Cotton Batting because of the high percentage of cotton. I have never seen the Warm Co call it 100% Cotton or label it as such.