"Buy the Roc-Lon 20\" x 3yd. Fusible Sheerweight Polyester Interfacing at Michaels. com. Roc-Lon® fusible sheerweight interfacing is great for use with sheer to lightweight fabrics as well as collars, cuffs, pockets, fronts and crafting. It can cut in any direction and will not ravel. Roc-Lon® fusible sheerweight interfacing is great for use with sheer to lightweight fabrics as well as collars, cuffs, pockets, fronts and crafting. It can cut in any direction and will not ravel. So it's particula