Never occurred to me to check the backs. I've used double & triple needles for bags and home dec, but not yet for quilting. I did see one online video that talked about using 100wt thread with a triple stitch. I guess that would make it so the stitching lines were much more apparent than the zig-zag part but I suppose it would still be visible. I've been meaning to give it a try. May have to give it a try & post the results.