I used the pellon featherweight, heavy weight and medium weight fusible interfacing. They all are still soft and "free flowing".. they are still cuddly on my quilts. I had never used interfacing before, but since this was the first time I worked with tshirts I was concerned and wanted to be sure things worked out. I am glad that I did use the interfacing... it made the tshirts easier tow work with. I gave them some body so they weren't so floppy and flimsy
I did have a problem with the last batch I interfaced, it just did not "stick" Someone here thought possibly the shirts were washed with fabric softener, as fabric softener interferes with the adhesion of the interfacing.. so keep the fabric softener in mind when you interface