Products are split into three levels based on ingredient labels
Thinx
Period Underwear
Last verified: May 13, 2026
- Polyamide
- Elastane
- Supima Cotton
- Lenzing Micro Modal
- Polyurethane Laminate (PUL)
- Polyester
Why This Product is Rated STOP
Period Underwear by Thinx has been evaluated by Million Marker and contains ingredients with known health concerns. This product is rated STOP, indicating higher concern.
We recommend avoiding STOP-rated products and seeking safer alternatives from our GO or SLOW categories.
Frequently Asked Questions
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