The Shulchan Aruch cites the opinion of Rabbi Joshua Boaz ben Simon Baruch, (d. 1557), who permitted the wearing of wigs. In some hasidic sects, sheitels are avoided as they can give the impression that the wearer's head is uncovered. In other groups women wear some type of covering over the sheitel to avoid this misconception. In stark contrast, the Lubavitcher Rebbe encouraged all married Jewish women to wear only sheitels. Today most wigs used by Jewish women come with kosher certification, indicating that they are not made with hair originating from idolatrous rituals.