I am working on a throw right now that has flannel on the back - it is a better quality fabric and I did pre-wash it and dry it before using it. I have another quilt that I got at a garage sale that has flannel on the back and it was either a flannel sheet or cheaper flannel. It's held up well - I've had it for 15 yrs and when I'm cold in the winter - it's my favorite to grab. The flannel backing does seem to make a difference - and maybe it's just because I love the way it feels.