Judy Woodworth, recently took a class by her, states that she oftens quilts with two layers. One being wool and the second layer 80/20. The wool gives it a trupunto look. Just be prepared when washing and drying you may have to take a trip to the laundry mat. I made an oversized king, 120 X 126", double sided flannel with one layer of warm and natural and it takes over 5 hours to dry it in the dryer. I wash it every month as the doggies sleep with us.