The felt I have must be cotton. It holds fabric blocks without pins. It is superior to the flannel for sticking power. It must be vintage. It's very thick and not like the felt I've seen at stores now. I found two bolts of it at an estate sale for $2 each. One gray and one cream color. Eleanor Burns uses vehicle head liner fabric for her design wall. Fabric sticks to that great. Most car body shops have it on long rolls.