That's a good question. I'm wondering what it would look like after a washing or two? If it were me, I'd do the double layer of identical batting. Other folks on the QB swear by the wool batting but I have never used one. I used the warm and natural on a couple of quilts and although I like the look and they are wearing well, they just aren't warm enough for the kind of winters we have here in central New York. Keep in mind, I sleep on a heated water bed and have wicked hot flashes and I'm still saying this.