I usually use two pcs of warm and natural and one of insulbrite. Works for me, but if I am ot od insulbrite I use three pcs of batting. I found that two pcs of batting didn't shield from the heat very good. My machine has no problems sewing through all this, it is a Elna 740. Sews through like butter. I also use a walking foot. I have found it hard to get insulbrite around here for a while, as soon as I fund it I am gong to buy a lot, lol.