I did my first top that was fleece for a backing and no batting about a year or so ago, it was fine to work with. It was a child's quilt with sailboats and I quilted it with an all-over clamshell pattern that was probably 6-8" point to point. I think that I would still prefer to have a thin layer of something between the top and fleece, especially if you have a light top and a boldly printed fleece back.