Shatnez is a prohibition in Jewish legislation in opposition to carrying a garment made out of a mix of wool and linen. The Torah states that “You shall not put on shatnezwool and linen collectively” (Deuteronomy 22:11), and this prohibition is repeated within the Talmud (Shabbat 110a).
There are a variety of explanation why shatnez is prohibited. One purpose is that it’s a combination of two several types of fibers, which is taken into account to be a type of idolatry. One more reason is that shatnez is uncomfortable to put on, and it will possibly trigger pores and skin irritation.
