I like using invisible thread on 'focus' fabrics that I've used & SID. You can't see it from a distance - or your mistakes either... I used cotton thread on the backing. It is soft, not scratchy at all. You need to practice a bit with it first - I used cheap 'invisible' thread once & the thread kept breaking & consequently used a dark cotton thread on a focus fabric quilt & it looked awful. I was a bit turned off, but finally got some nicer quality invisible thread & it works just fine. I used medeira, since it's what is available here. It comes in clear or 'smoke' color.