Why Don’t Sheep Shrink In The Rain?

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Getting wet isn’t REALLY what makes wool shrink; it merely exacerbates the friction between the wool fibers, which is stronger in one direction than another, so when agitated in the washer or dryer, they migrate in relation to each other in a process called “felting.”

To learn more about this topic, start your googling with these keywords:

Fiber: a threadlike structure forming part of the muscular, nervous, connective, or other tissue in the human or animal body

Felting: the process by which wool or another textile can be agitated, often along with moisture or heat, to cause the fibers to migrate amongst themselves and mat together into a dense smooth surface

Ratchet: a ...