Hey, WHAT IS INTERFACING?!
It is a non-woven material that is used in sewing to stiffen or reinforce fabric. An example would be a shirt cuff or collar. Typically, it comes in white and I am looking for the type that is “fusible” in that it can be ironed to a fabric for a bond. One company that makes a lot of it is Pellon. It is great for this application because, as a non-woven fabric, it is much more effective at blocking small molecules…..like a virus (for example)!