I love Patons Classic, but I could never knit a sweater with it. I've heard that since it does felt extremely well the slightest bit of heat+moisture+aggitation will felt it. In other words, if your underarms get sweaty you're going to have felted pits which is a bummer when you've spent hours knitting a sweater. I only use sythetic wool blends or superwash wool for garments, but Patons is excellent for other projects - especially ones that require felting. IMHO it felts so much better than Lion Wool.