I had to look it up. My mom used something similar when she ironed my dad's shirts when she ironed the buttons area. Just wonder if you got a military wool blanket, cut it into pieces and it would do the same thing. When I iron my embroidered items I use a pressing cloth. I also have a June Taylor pressing pad with a rotary mat on the other side. It's used mostly when I travel but have used it when pressing my embroidered squares.