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You could be entitled to up to $52 as part of the Thinx class action settlement if you bought Thinx underwear. Thinx has agreed to pay $4 million to settle allegations that the chemicals used to make its period underwear are hazardous and have a serious negative impact on health.

Thinx LLC, a business that sells menstrual underwear and other menstrual and incontinence products, has been named in a class action lawsuit. The short-chain per- and polyfluoroalkyl substances (“PFAS”), the Agion anti-microbial treatment, and the underwear line made of organic cotton are all allegedly dangerous chemicals found in the products, according to the lawsuit. All of the accusations are denied by Thinx, and it also maintains that it did nothing improper or illegal. Thinx further affirms that PFAS were never incorporated into the creation of its products. The proposed settlement does not represent Thinx’s admission of any wrongdoing or guilt.

The plaintiffs claimed in their lawsuit that Thinx used harmful polyfluoroalkyl substances (PFAS) in its products. Due to their water resistance and non-stick properties, PFAS chemicals are used, but they may have harmful health effects, including cancer. Period underwear is one of many menstrual and incontinence management products offered by the Thinx brand. Thinx hasn’t admitted to doing anything wrong, but it has agreed to pay $4 million to settle a class action lawsuit about these claims.

Can I join the settlement?

The settlement class includes all people who bought thin period underwear in the United States from November 12, 2016 to November 28, 2022. Thinx period underwear included in the Settlement Class are the following: cotton brief, cotton bikini, cotton thong, sport, hiphugger, hi-waist, boyshort, french cut, cheeky, and thong.

The Settlement Class does not include any entity in which Thinx has a controlling interest, nor does it include the judge in charge of this action or the judge’s immediate family.


Thinx has agreed to pay $4 million into a settlement fund to compensate class members. Thinx has also agreed to provide an additional $1 million to cover valid claims, if necessary. Settlement class members can choose between getting a cash refund for up to three pairs of Thinx underwear they already bought or a one-time voucher they can use to buy Thinx underwear in the future.

  • Options for cash reimbursement
    • A $7.00 refund for up to three (3) pairs of Thinx period underwear purchased with proof of purchase, or up to $21.
    • Up to three pairs of Thinx period underwear that you bought but don’t have proof of purchase will get you a $3.50 refund each up to $10.
  • Voucher alternative:
    • A discount of 35% off future purchases of up to $150 worth of eligible voucher products in a single transaction on the Thinx website ( (maximum discount $52.50).

Settlement Website

Important Dates

  • Claim Form Deadline: April 12, 2023
  • Final Approval Hearing Date: May 24, 2023
  • Objection/Exclusion Deadline: April 12, 2023