U by Kotex Clean & Secure Ultra Thin Pads
Skip until Kotex discloses waterproof layer chemistry; fluorinated coatings often used.
Waterproof backing prevents leaks, a function historically filled by PFAS-based treatments. Kotex doesn't claim PFAS-free status or provide verification.
The safe swap
OB
O.b Pro Comfort Super Plus 16 pad
70/100 safety
Same rubric that flunked this product. The swap earned Good.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Nonwoven fibers (cellulose/synthetic blend) with waterproof backing layer, composition not fully disclosed
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What’s concerning
Waterproof / stain-resistant treatment
Water-repellent treatments have historically contained PFAS chemicals.
Category baseline
PFAS exposure happens more often with clothing products.
No PFAS disclosure
The company has not publicly discussed PFAS in this product.
PFAS
Waterproof backing composition not disclosed; fluorinated polymers are standard industry practice for this function, creating high probability of PFAS presence. No brand statement rules this out.
Source: ATSDR ↗Microplastic shedding from degraded nonwoven fibers
Nonwoven synthetic-cellulose blends can shed fibers if repeatedly wetted and flexed; no specific Kotex testing is public, but fiber loss from period pads is a recognized concern in textile microdebris literature.
Bacterial colonization if not changed regularly
All absorbent pads create a moist environment; failure to change within 8 hours increases toxic shock syndrome and vulvovaginal infection risk, this is not unique to Kotex but applies universally to the product type.
Skin irritation from adhesive or fragrance
Some Kotex pads contain fragrance; adhesive systems can trigger contact dermatitis in sensitive individuals. Specific formulation data for this Ultra Thin variant is not disclosed, so individual tolerance varies.
What’s reassuring
Heavy metals
No public recalls or testing data implicates azo dyes, lead, or cadmium in Kotex period pads. Nonwoven fibers are not typically dyed in this category.
Source: FDA ↗The full breakdown
What it's made of and why it matters
U by Kotex Ultra Thin pads use a nonwoven cellulose-synthetic fiber blend as the absorbent core, which is a standard and generally safe material class for period products. The waterproof backing layer, the critical component, is not fully disclosed by the brand; industry practice often employs fluorinated polymers (Teflon-type coating or similar) to achieve waterproofing, which introduces PFAS risk. Nonwoven fibers themselves do not pose established hazards like formaldehyde or heavy metals at levels of concern in this application, but the opaque backing chemistry is the weak point.
The brand's record and disclosure
Kotex has not publicly committed to PFAS-free formulations or disclosed the specific chemistry of waterproof backing layers across its product lines. The brand has received no major safety recalls for period pads in recent years, but maintains a pattern of minimal transparency regarding chemical composition compared to competitors like Seventh Generation or Cora, which explicitly market PFAS-free alternatives. Kotex's parent company Kimberly-Clark has faced broader scrutiny over plastic and PFAS use in disposable products but has not issued category-specific pledges for menstrual care.
How it compares in its category
This product sits in the mid-tier of conventional pads: more affordable than premium organic or indie brands, but with less transparency than certified PFAS-free competitors. Comparable mainstream options (Tampax, Always, Stayfree) face identical backing-layer opacity issues; however, brands like Cora, Seventh Generation, and Rael explicitly certify PFAS absence and disclose full ingredient lists. If PFAS exposure is a priority, this product offers no competitive advantage and falls behind the growing market segment of fluorine-free pads.
If you buy it
Standard pad hygiene applies: change every 4-8 hours to reduce bacterial overgrowth risk and skin irritation. Store in a cool, dry place; do not expose to direct heat or sunlight, as cellulose blends can degrade and microplastic shedding may increase, though this is not documented as a specific risk for Kotex pads. If you notice persistent irritation, odor, or rash, discontinue and consult a gynecologist, some individuals react to fragrance or materials in the backing layer. Consider switching to an explicitly PFAS-disclosed brand if available in your price range.
What we don’t know
- Basis
- Model estimate, 45% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Kotex has made none
Formulations change between production runs, so check the current label. How we grade.
Safer alternatives in Period Pads
OB
O.b Pro Comfort Super Plus 16 pad
rayon/viscose, cotton, and gelling polymers
Microplastic shedding or degradation
Limited concern
Irritation or allergic sensitization from adhesive or synthetic fibers
Moderate concern
Bacterial growth or contamination from prolonged moisture
Limited concern
Lower concern. Typical period pad materials lack PFAS triggers.
⚠Risky category by default
OB
/ Maternity Pad Maxi Super Absorbency NON241279
cellulose, polyethylene, absorbent core (typical period pad materials)
Absorbent polymer (sodium polyacrylate) allergic sensitization
Limited concern
Polyethylene microplastic shedding
Limited concern
Bacterial colonization from prolonged wear
High concern
Lower concern, typical pad materials rarely require PFAS treatments.
⚠Risky category by default
OB
OC BON Ultra Thin Wings Sanitary Pads Medium 4P
Cellulose, nonwoven synthetics, adhesives
Adhesive contact sensitivity
Limited concern
Bleaching residues in cellulose
Limited concern
Lower concern. No PFAS-prone materials publicly identified.
⚠Risky category by default
More period pads 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.