It depends on whether you'll be sewing the appliques after fusing them on or not. Some fusible materials are not intended for sewing and will gum up your needle badly. If you will be sewing, then I recommend a light weight fusible. There are several brands and different people have their own favorites. I purchase what's on sale, and don't really have a favorite but Steam-a-seam Lite is one brand. There is also Heat'n'bond Lite brand. Again, if you're sewing them after fusing, then either will work.