Originally Posted by sushi
While I've not used it as backing, I've used fleece as batting a couple of times when I've needed to produce an ultra-warm quilt. It's worked beautifully.
While some think fleece is too expensive to use as batting, remember that because it's encased between the top and the backing, you can use the cheapest stuff available. (I have a "Mill End Textiles" near me where I bought a remnant at ~$3/yd.)
that's actually a good idea and you can always pick it up cheap when Joann's has its sales - I think the anti-pill fleece is the cheapest. I think with a coupon, it's still cheaper than batting.