There is wool batting, also. I believe Quilters Dream makes it and some other brands also. I just prefer Quilters Dream, though have never used the wool. I think theirs is washable which might be a problem with the older wool blankets. I made one DGD a quilt with regular pieced cotton top, Quilters Dream Plush cotton batting which is their thickest bat, and a flannel backing and that is sure one heavy quilt. I quilted it on my Pfaff 2134 dsm. If you are using flannel for top and backing I would think either the plush cotton or the wool batting would make a very cozy quilt.