Kotex · Incontinence Pads & Protection
U by Kotex Kotex U by Fitness Ultra Thin Pads with Wings
Waterproof backing likely contains PFAS; brand discloses nothing.
Period pads require water-resistant backings, commonly treated with PFAS. Kotex does not disclose materials or PFAS status, leaving exposure risk unclear.
The safe swap
Tranquility
Tranquility Personal Care Pads 13.5" x 6.5", 96/Case
70/100 safety
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
absorbent core, waterproof backing layer (unspecified polymer)
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Waterproof / stain-resistant treatment
water-repellent coating treatments have historically used PFAS.
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 Fitness Ultra Thin pads use an absorbent core (typically wood pulp, super-absorbent polymers like sodium polyacrylate) topped with a waterproof backing layer of unspecified polymer composition. The backing layer's chemistry is critical because waterproofing in period products is almost universally achieved via fluorochemicals (PFAS compounds) that repel moisture and oils, though Kotex does not publicly identify the specific polymer type or confirm PFAS presence. The absorbent core itself carries no established heavy metal or formaldehyde risks typical of this material class, but the undisclosed backing raises concerns about what leaches during extended wear against sensitive skin.
The brand's record and disclosure
Kotex (owned by Kimberly-Clark) has not published ingredient transparency reports, material certifications (such as Oeko-Tex or similar), or PFAS testing data for this product line. The brand maintains industry-standard silence on PFAS content despite growing public awareness of fluorochemicals in period products. No major recalls or contamination incidents have been publicly documented for this specific product, but the absence of disclosure is not the same as absence of risk. Competitors like Seventh Generation and Cora have begun labeling PFAS-free claims, making Kotex's non-disclosure a notable gap in consumer information.
How it compares in its category
Ultra-thin pads in the mass-market segment (Kotex, Tampax, Always) typically rely on plastic-polymer backings to achieve thinness and leak protection; virtually all use undisclosed waterproofing chemistry suspected to contain PFAS. Premium or eco-focused brands (Cora, Rael, Seventh Generation) market PFAS-free or plastic-free alternatives, often with full ingredient transparency. Kotex positions itself in the value/mainstream tier, accepting lower disclosure standards in exchange for broader retail availability and lower cost. If PFAS exposure during menstruation is a personal concern, this product sits at the higher-risk end of the disclosure spectrum.
If you buy it
Use pads as intended and replace every 4-6 hours; extended wear increases skin contact with the waterproof backing and any leachables. Avoid heat exposure (do not wash or iron after use); heat can theoretically increase migration of polymers, though this is not documented for this product. Store in cool, dry conditions; moisture or heat in packaging is unlikely but could degrade the backing over time. If you develop persistent skin irritation, contact dermatitis, or vaginal discomfort, consider switching to a brand with transparent material labeling to identify potential triggers.
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.”
PFAS in waterproof backing layer
Waterproof polymer backings in period products are not FDA-regulated and typically rely on fluorochemical coatings to repel menstrual fluid. Kotex has not disclosed the backing polymer type or tested for PFAS, but chemical engineering literature and industry practice indicate PFAS is the standard choice for this application. Prolonged skin contact during use raises potential for dermal absorption
Skin sensitization or irritation from undisclosed polymers
Extended contact between the waterproof backing and vulvar/vaginal skin during a typical 4-6 hour wear period may trigger irritation in sensitive individuals, particularly if the backing contains degradation byproducts or processing residues. Without material transparency, individual reactions cannot be predicted. No recalls document this, but anecdotal reports of Kotex-related irritation exist on
Microplastics or polymer shedding from backing layer
Polymer backings can degrade or shed microscopic particles, particularly if the pad is worn in humid conditions or for extended periods. Kotex has not tested for shedding, and menstrual absorption studies do not routinely measure microplastic release. Long-term vaginal exposure to polymer particles has not been formally evaluated for safety.
Chlorine bleaching residues in absorbent core
Wood pulp in absorbent cores is typically bleached using elemental chlorine-free (ECF) or totally chlorine-free (TCF) processes in modern manufacturing. Kotex does not disclose which process is used, but dioxin or chlorine residues are not documented as concerns in this product class by regulatory bodies.
Fragrance additives or skin sensitizers
U by Kotex Fitness products are marketed as unscented, reducing exposure to fragrance allergens. No formaldehyde releasers or sensitizing chemical additives have been documented in this line.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 42% 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 Incontinence Pads & Protection
Tranquility
Personal Care Pads 13.5" x 6.5", 96/Case
Cellulose, wood pulp, absorbent core, adhesives
Lower PFAS concern. Typical absorbent pad with no known treatment.
⚠Risky category by default
Tranquility
Essential Booster Pads Heavy Absorbency, Long - 4-1/4 x 15 Inch (Case of 200)
cellulose/fluff pulp absorbent core with nonwoven layers
Lower concern. Core materials inherently PFAS-free, no evidence of water-repellent coating treatment.
⚠Risky category by default
Kotex
Absorbent Wrapped Liners
Cellulose-based absorbent core, wrapped nonwoven
Lower concern. No known PFAS use in standard absorbent liners.
⚠Risky category by default
More incontinence pads & protection 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.