I use two battings on most of my quilts, unless it really just a summer quilt. I use one layer of cotton with a layer of poly on top. The cotton is for a bit of weight, and for the crinkle antique look when washed. The layer of poly is for the warmth and to give a bit more definition to the quilting. Double batting a cotton and poly is a bit cheaper than wool and both battings are readily available. The layer of poly makes the drying time much less than if I had used another layer of cotton or wool.