Having used the different fibers felt does not work at all to smooth and nothing for the fabric to hang on to. Fleece works great to pick up threads so a piece in your swifter cleans the floor, Flannel is wonderful but I tend to leave things up on my wall a while and a breeze or the weight will pull them down sooner or later. So I would rather use flannel to back my quilt. The insulation wall boards are fantastic, economical to purchase, easy to stick pins in and you don't really have to cover them.