![](https://www.classaction.org/media/corrado-2022.jpg)
A class action alleges Knix Wear menstrual underwear is unfit for its intended use because it contains unsafe synthetic chemicals.
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Knix Period Underwear PFAS Forever Chemicals Laboratory Results
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Australian period underwear makers deny using 'forever chemicals' after Thinx settles suit in US, PFAS
![](https://i.dailymail.co.uk/1s/2023/01/27/22/67055561-11667903-image-a-1_1674857585403.jpg)
Up to 65% of period underwear contains toxic forever chemicals linked to infertility
![](https://i.guim.co.uk/img/media/877ad74ce737b08dd2f084bfa05dce86415ff876/0_40_1820_1092/master/1820.jpg?width=460&quality=85&auto=format&fit=max&s=ed5a25c68c39e81d9185b8452e024e86)
Australian period underwear makers deny using 'forever chemicals' after Thinx settles suit in US, PFAS
![](https://i.dailymail.co.uk/1s/2023/01/27/22/67055939-0-image-a-25_1674857337352.jpg)
Up to 65% of period underwear contains toxic forever chemicals linked to infertility
![](https://m.media-amazon.com/images/I/51iI35oN9RL._AC_UF350,350_QL80_.jpg)
![](https://www.vinhobr.com.br/produtos/casillero_del_diablo_rose_vinhobr.webp)
![](https://i.pinimg.com/736x/c0/43/ea/c043eaaaa333c28549430df1b413698d.jpg)