I have made several all wool quilts over the years purely for the healing warmth on my (polio) legs. I make just large 8-9 in. squares, trying for a 9-patch effect. I do use batting and a flannel back. They launder just fine in cold water and line dry. Some folks are allergic to wool, but my son has two of mine, so far. I got my wool scraps when they were donated to my church for World Relief and we could use only cotton. A friend of mine has an old family quilt made from men's suits. Now that one is heavy!