Kelly, I always back mine with flannel which is well washed and shrunk (old sheets and pillowcases from yard sales is my "supplier"). When I then quilt it gives the embroidery extra puffy look. I've tried the fusible and wasn't happy and with the handling, the fusible came loose on the edges of the block. All in all, not satisfied. Muslin is also excellent, but make sure you've washed and shrunk it first and then just hand baste it to the top fabric.