This is the season for woolen: warm, insulating yarns that are light in weight and cozy. But...you ask, what makes a yarn woolen? The short answer is woolen yarns are spun with fibers opened up, but going all which ways to trap air inside the yarn. They are lighter in weight, but warmer than worsted spun yarns. They tend to hold a shape, are not "hard wearing" and they can pill... but they are great for hats, blankets...sweaters, warm woolen mittens and other of my favorite things.
If you want a bit of a longer explanation...read on.
