Shatnez ( Hebrew שעטנז) is the prohibition in Jewish law derived from the Torah that prohibits the wearing of a fabric containing both wool and linen (linsey-woolsey); this forbidden mixture is referred to in Judaism as shatnez. The relevant parts of the Torah (Leviticus 19:19 and Deuteronomy 22:5, 22:9-11) prohibit an individual from wearing wool and linen fabrics in one garment, the interbreeding of different species of animals, and the planting together of different kinds of seeds (collectively known as kilayim).
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In this FAQ you can find brands which their clothing contain Shaatnez