I use Polar fleece (the fabric used for jackets) to back a lot of my quilts since I have family in Utah where it gets really cold...they like the snuggliness of it. It's 60" wide so most of my fleece backed quilts are that width. I buy it on sale for under $10 a yard and less. It machine quilts nicely and honestly, it's not going to lump or do anything weird so it's perfect for grandson quilts where I quilt it in a few straight lines to just hold the top and the fleece together. Fleece has some kind of base that holds it together (I found this out when I substituted it for batting in a purse pattern and tried putting grommets through it.....you can't!) so it would hold up to washing much better than exposed batting. All said, I often use the fleece with the quilt top (the fleece is the backing and batting, so just two layers) and love this.