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According to Halacha, what is the minimum shiur (size) of shaatnez in a garment for it to become prohibited to wear?

Is it even a single thread, a certain amount of inches, etc.?

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The Rambam (MT Kilayim 10:5) answers your question

There is no minimum measure for kilayim. Even the smallest thread of wool in a large linen garment or a thread of linen in a woolen garment is forbidden.

R Elyahu Touger explains why (based on Tosafot Nidah 61b)

Generally, a forbidden entity can become nullified, because it is of no consequence when compared to the kosher substance into which it is mixed. Such logic does not apply in this instance, because there is no prohibited object to be nullified. Both the linen and the wool are permitted. Hence, they remain significant no matter how small an amount there is.

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  • The halacha is clear, but according to Rav Chaim Kanievsky z"l (Derech Emunah ad loc.), the Rambam understands the reason differently.
    – N.T.
    Commented Dec 25, 2023 at 6:29

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