I have used fleece for backing and never had a problem. I did not use a batting just the fleece for backing. I usually do this for a lap quilt. It is very comfy/cozy.

I got a nice fleece blanket [cheap] to use as batting/backing for a quilt that's going in a window to insulate me from the cold/hot sun. I didn't want the sun to fade/ruin good fabric, and I don't care about the backside.

fleece makes great rag quilts; it doesn't fray but it curls and is really pretty. It's great for people who are afraid of giving flannel rag quilts to babies due to the raveling. Im getting ready to make a jacket with some that was sent to me. My daughter also used fleece as a backing to a baby quilt; the new mother loved it

If your top is already pieced, then when you wash it include a Shout Color Catcher sheet with the quilt top and it will catch any colors that run. You can find the color catchers in the laundry soap part of your super market. And if your quilt top has a lot of dark colors in it then I would put two of the sheets with it when you wash it.

I don't use fleece for batting, but I do use it sometimes instead of batting on the back of quilts

I made a baby quilt and used fleece for the batting. The matieral I used when making the quilt was eylet.It worked fine.