DAME · Panty Liners
U by Kotex Security Lightdays Liners
Lower concern; basic absorbent pad with no water-repellent coating typical of PFAS exposure routes.
U by Kotex Lightdays Liners are simple absorbent pads made from standard nonwoven materials without water-resistant or stain-guard treatments that typically introduce PFAS. The brand makes no PFAS disclosure, but the product category and material composition carry lower inherent risk than waterproofed or coated period products.
Shop DAME on Amazon →Material
nonwoven blend (polypropylene, rayon), adhesive; no water-repellent coating or stain-resistant treatment indicated
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
Category baseline
period care is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
The full breakdown
What it's made of and why it matters
U by Kotex Lightdays Liners use a nonwoven blend of polypropylene and rayon as the absorbent core, with a polyethylene backing and pressure-sensitive adhesive for attachment. Polypropylene and rayon are chemically inert at body temperature and have no known leaching risk under normal use conditions. The adhesive is a standard hot-melt type not formulated with volatile solvents, so off-gassing risk is minimal. Notably, there is no water-repellent coating (water-repellent coating) treatment mentioned, which eliminates a major PFAS exposure route common in period products.
The brand's record and disclosure
Kotex (owned by Kimberly-Clark) has published a Transparency & Responsibility Report that addresses ingredient safety and manufacturing, though specific claims about this product line are limited. The brand does not advertise PFAS-free status, nor does it appear to have faced recalls or safety controversies specific to panty liners. Public ingredient disclosure is typical for the category but not exhaustive; full adhesive and ink formulations are not detailed on packaging. No third-party certifications (e.g., Cradle to Cradle, GOTS) are marketed for this product.
How it compares in its category
Panty liners are lower-risk products than tampons or pads because they involve minimal absorbency and shorter contact time. U by Kotex's Lightdays line sits in the mainstream segment, competing against brands like Always and Kotex Fitness; all use similar polypropylene/rayon construction without advanced coatings. Some premium or eco-focused competitors (e.g., Aunt Flow, Rael) market organic cotton or compostable alternatives, but evidence of superior safety is not documented. This product's chemical profile is typical and unexceptional for the category.
If you buy it
Store liners in a cool, dry place away from heat and direct sunlight to prevent adhesive deterioration. Replace the product if the backing becomes sticky, crumbly, or if adhesive residue transfers to skin, as this signals material breakdown. Use as directed on the package; no special precautions are needed beyond normal hygiene. Dispose in household waste; do not flush, as nonwoven materials do not degrade in wastewater systems.
Beyond PFAS: other things we checked
Established hazard classes for this product type, assessed from public information. These never change the PFAS grade; a Likely flag caps the Verdict at “Buy with care.”
Adhesive leachates or sensitization
Pressure-sensitive hot-melt adhesives in panty liners are not typically formulated with plasticizers or volatile organics that pose dermal risk. No contact dermatitis cases specific to this product have been reported in public records; rare individual sensitivities would be attributable to fragrance oils or perfume additives, not the base adhesive.
Rayon or polypropylene degradation and microfiber shedding
Rayon is a cellulose-based fiber that can degrade under friction or moisture exposure; shed fibers would be microscopic cellulose particles with no known toxicity. Polypropylene is chemically stable but can shed microscopic fragments if crushed or bent repeatedly; long-term biological impact is unstudied but considered negligible for a single-use product worn briefly.
Fragrance allergens or skin irritants
Kotex Lightdays products are typically scented with added fragrance compounds that can trigger contact dermatitis in sensitive individuals, though this is not a chemical safety hazard per se but rather an irritation risk. The specific fragrance formula is proprietary and not disclosed; individuals with fragrance sensitivity should patch-test or choose unscented alternatives.
Heavy metals in printing inks or colorants
The printed branding and surface layer of panty liners may contain ink, but panty liners have minimal skin contact duration and no wet environment that would promote leaching. No recalls or contamination cases linked to liner inks have been documented in regulatory or public health records.
Bacterial or fungal growth from moisture retention
If liners are stored in humid conditions or used in conjunction with inadequate changing practices, the moist environment and occlusive nonwoven material could promote localized bacterial growth. This is a hygiene issue, not a manufacturing defect, and is mitigated by regular replacement and dry storage.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 72% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
Safer alternatives in Panty Liners
Organyc
Maxi Panty Liners
organic cotton, hypoallergenic absorbent core
Lower-concern choice; organic cotton core with PFAS-free positioning, though lab independent verification remains limited.
✓Verified PFAS-free by a third party
Organyc
Folded Panty Liners
organic cotton, cellulose
Lower-concern choice; organic cotton liners with credible certifications, but no explicit PFAS transparency.
✓Verified PFAS-free by a third party
Natracare
Curved Panty Liners
organic cotton, viscose, plant-based materials
Lower-concern buy: organic cotton liner with strong transparency and third-party oversight of material sourcing.
✓Verified PFAS-free by a third party
More panty liners grades
How we score: every product runs through the same public 0–100 rubric based on materials, coatings, brand disclosure, lab findings, and recalls. See the full methodology → Spotted a mistake? Report an error.