Answer:
Wool does not technically shrink. It felts. Like a felt fedora, that is what happens to wool when it is heavily agitated. Hot water, drying, and even just machine washing wool causes felting if not dons correctly. As the fibers bind as they felt together, the area “shrinks”. The fibers themselves are being agitated and bound together, but not technically “shrinking” in size.
Proper care won’t shrink wool in the same way as cotton. You just have to care for wool properly.
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