Boiled wool
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Boiled wool is a special type of fabric primarily used in berets, scarves, vests, cardigans, coats and jackets. It is created using a mechanical knitting process which involves a set pattern that is then shrunk.
Wool felt and felted wool are similar to boiled wool. Wool felt is created commercially and results in uniform fabric thickness. Felted wool is created by first weaving wool to create an item then washing it, resulting in a solid, dense fabric that is about 30% smaller than the original woven material.