The batting is Cotton or Wool, these are natural fiber and breath nicely. I have 2 batting on my bed quilt, cotton and wool. I did this mainly for the texture of the quilting.
which is beautiful "Storm at Sea" quilt if you'd like to look at it.
The thing I'm most happy with using the dbl batting is that summer/winter I still use the quilt. It isn't really to warm that poly might be. And being in my 50's, to warm is just to warm!
Congrats on the gift of batting!