Kotex Ultra Thin Heavy Pads with Wings
Lower concern than apparel, but waterproof layers raise unanswered PFAS questions.
Waterproof backing is standard in pads but Kotex doesn't disclose PFAS presence or avoidance. No third-party testing exists for this product.
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
Cellulose, synthetic absorbent core, polypropylene layers, waterproof backing
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
Polypropylene or polyethylene waterproof layers commonly use fluorinated or silicone water-resistant finishes; Kotex has not disclosed whether PFAS compounds are used. Skin contact duration is intermittent and localized, lowering acute exposure risk compared to apparel worn for extended periods.
Source: ATSDR ↗What’s reassuring
Synthetic fragrance and additives
Kotex Ultra Thin Heavy lists no added fragrance on packaging. No reported cases of allergic reaction or fragrance-related dermatitis specific to this product line, though sensitivity varies by individual skin microbiome.
Superabsorbent polymer (SAP) integrity
SAP core is chemically stable under normal use and does not leach into the body. No established link between SAP exposure and systemic health effects, though localized skin irritation is possible in sensitive individuals if pad integrity is compromised.
Cellulose sourcing and bleaching residue
Kotex does not disclose whether cellulose is chlorine-bleached or oxygen-bleached. Standard industry chlorine bleaching can leave trace dioxin residues, but exposure from a single pad is negligible; no recalls or health complaints tied to bleach residue in this product exist.
Microplastics
Polypropylene layers are durable under normal use and do not shed microplastics during wear. Risk would only materialize if pad is heated, mechanically damaged, or disposed of in ways that fragment the plastic (e.g., incineration), which is outside typical consumer use.
Source: EPA ↗The full breakdown
What it's made of and why it matters
Kotex Ultra Thin Heavy uses cellulose as the primary absorbent layer, which is a natural, biodegradable material with minimal chemical processing. The synthetic absorbent core (typically superabsorbent polymer, or SAP) is designed to lock moisture away from skin. Polypropylene layers provide structure and shape retention. The waterproof backing prevents leakage but is where PFAS-type water-resistant chemicals are most likely used, though Kotex has not disclosed specifics.
The brand's record and disclosure
Kotex (owned by Kimberly-Clark) does not publicly disclose detailed chemical composition, ingredient certifications, or explicit PFAS policies for menstrual products. No major recalls or safety controversies specific to this pad line are on record. The brand has not pursued third-party certifications like Cradle to Cradle or OEKO-TEX for this category, which limits independent verification of chemical safety claims.
How it compares in its category
Most mainstream pads (Tampax, Always, U by Kotex) use similar cellulose-SAP-polypropylene construction; chemical hazard profiles are largely equivalent across brands. Organic or certified-safer alternatives (Seventh Generation, Cora, Rael) typically disclose ingredients more transparently and claim to avoid synthetic fragrances and chlorine bleaching. Kotex Ultra Thin occupies the standard mainstream tier without differentiation on safety transparency.
If you buy it
Change pads every 4-8 hours to prevent bacterial overgrowth and reduce skin irritation risk. Do not use heat (washing machine hot water is fine; do not microwave or expose to direct heat). Replace immediately if you notice rash, itching, or odor changes, which may indicate skin sensitivity or moisture breakdown. Store in a cool, dry place away from direct sunlight to prevent material degradation.
What we don’t know
- Basis
- Model estimate, 52% 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.