PFAS in Panty Liners, Why Wrapping Format Beats Brand Name

We graded 15 panty liners from Kotex, Always, Carefree and Thinx. Two individually wrapped Kotex liners grade 70, the highest in this category. The other 13, including a third Kotex product sold in bulk, grade 25 on a water-resistant backing layer of unstated chemistry.

The clearest pattern here is inside Kotex's own lineup. Its two wrapped liners grade well while its 120-count bulk liner, sold under the same brand name, grades at the bottom with everything else.

Summary comparison table

Product	PFAS grade	Backing as recorded
Kotex Core Daily Wrapped Liners	Good, 70/100	Cotton, rayon, adhesive, no waterproof layer named
Kotex Wrapped Liners	Good, 70/100	Cellulose/cotton core with adhesive backing
Kotex Regular Liners 120ct	Poor, 25/100	Synthetic blend, waterproof backing layer
Always Daily Protect Panty Liners	Poor, 25/100	Nonwoven/cellulose with waterproof backing
Carefree Panty Liners	Poor, 25/100	Nonwoven polypropylene, water-resistant coating unspecified
Thinx Leak-Fighting Rotation Set	Poor, 25/100	Cotton/synthetic blend, waterproof coating unspecified

How we graded these

Every grade here is a model-based estimate built from publicly available product information and manufacturer disclosures, not a lab test performed by our team. A high score means lower concern based on reviewed sources, never PFAS-free and never safe. Across the 15 liners the spread is two at 70 and 13 at 25. None of these brands has a PFAS statement on record for the liners we graded. Look up any liner in our PFAS product finder.

Why the two wrapped Kotex liners grade 70

Both liners are recorded with a cotton or cellulose absorbent core and no waterproof backing layer named. That is the highest grade in this category, though it still rests on the absence of a stated treatment, not a PFAS-free claim from Kotex, which we found none of.

Why the other 13 grade 25

Every other liner in this guide, including Kotex's own 120-count bulk liner, is recorded with a waterproof or water-resistant backing layer whose composition is not disclosed. Leak-proof backing is exactly the kind of repellent-layer chemistry PFAS compounds are used for, and none of these makers, Kotex included, has published a PFAS statement, so an undisclosed waterproof layer keeps all 13 at the bottom.

What to avoid

• Bulk-format liners from a brand that also sells wrapped versions. Kotex's own 120-count liner grades 25 while its two wrapped liners grade 70.
• "Leak-lock" or heavy-absorbency marketing language without a named backing material. Every liner carrying that kind of claim here grades 25.
• Assuming a brand's reputation applies to every SKU. Check the specific product in our product finder rather than the brand name.

Our pick

Based on available materials and data, the Kotex Core Daily Wrapped Liners and Kotex Wrapped Liners are the two liners in this guide at lower relative concern, on the absence of a waterproof backing layer rather than any certification. Kotex's own bulk liner and every product from Always, Carefree and Thinx grade lower on that same gap.

FAQ

Do panty liners typically contain PFAS?

We can't say for certain. Thirteen of the 15 liners graded here carry a waterproof backing layer of unstated chemistry, the kind of leak-proof engineering where PFAS use has historically been common.

Why does one Kotex liner grade so differently from the other two?

Grading here is product-specific, not brand-wide. The two wrapped Kotex liners have no waterproof layer named, while the 120-count bulk liner does, which is the entire gap between a 70 and a 25.

Does a Poor grade mean a liner is unsafe?

No. It means our model found a waterproof backing of undisclosed chemistry, a data gap, not a confirmed detection. Any broader link between PFAS exposure and health effects comes from population-level research showing association, not causation for a specific product.