Our take
Why It’s on Our Radar
We don't recommend it as a clean pick. It's conglomerate-owned and settled a class action after independent testing found PFAS in products marketed as non-toxic. It's here as a cautionary reference, with founder-owned, PFAS-tested alternatives above.
What's inside
Ingredients & Safety
Marketed as non-toxic, but independent 2020 testing detected PFAS "forever chemicals," and the brand settled a class action over it in 2023 (agreeing to steps to avoid intentionally-added PFAS going forward).
We read every line on this label. Nothing here is on our watch or caution list — no synthetic fragrance, no flagged chemicals.
Full Ingredient List
- Nylon
- Elastane
- Cotton Lining
Prefer a spotless pick? Natracare in Period Care is Clean Verified — every ingredient clean, with no recalls or lawsuits on record.
Who owns it
Ownership & Independence
Kimberly-Clark acquired a majority stake in Thinx in 2022 and completed the acquisition in 2024. Thinx is no longer independent.
Where to buy
Key Products
- Period Underwear View on Amazon →
- Period Activewear View on Amazon →
As an Amazon Associate, we earn from qualifying purchases. Commissions never influence scores.