I have made two good sized quilts using Joann's extra wide flannel. I'm one of those who does not prewash. I used my longarm to quilt, threw them in the washer and the dryer and there was some shrinkage (a look that I really like) but not enough to distort the quilt. It is not a great quality flannel but I felt it was good enough. Both quilts were for family members and very much appreciated so they will get used. I have since bought 3 yards in several colors so that I'm good to go on future quilts. It is such a treat not having to piece the backs.