I use fleece alot for quilt backs & I treat it the same as flannel or cotton. I prewash everything; lay it face down on the floor & tape the edges flat; lay my warm & natural on it & smooth it out; lay the quilt top on this & smooth it out & safety pin it my fists width apart; it takes time but it works. I quilt it the same way as any other quilt, it's not a race, so stitch slow enough for the walking foot to feed everything through at the same time; however I do not like dense panto type quilting, I stitch in the ditch & do a little free motion quilting approx. 4 or 5 inches apart. My quilts are still nice & soft & cuddly, and they are warm. Seems like we all have different experiences with our quilts, it's good to get lots of opinions & then try & find out what works for you.

I know at Joann's they have blizzard fleece and anti-pill fleece, which is a tad more expensive. I always go for the anti-pill, because I don't like pilling.

I have used batting before, but then I like a heavy quilt. Sometimes without it feels too flimsy for me, but maybe that's just me!

I made a mystery quilt about ten years ago and backed it with fleece. It was easy to do--don't stretch, just smooth--and warm enough to sleep under with temps in the 40's outside and no heat on at the lake. It is light and has lasted just fine. Keep the quilting minimal and the speed down.