Cups & Co · Period Underwear
The High Waisted Period. in Organic Cotton For Heavy Flows
Lower-concern choice; organic cotton period underwear has no inherent PFAS trigger, but brand transparency is absent.
This product is made from organic cotton, a natural fiber with no known PFAS application in period-care manufacturing. Cups & Co does not disclose PFAS-related testing or claims, which is typical for apparel, but also means no independent verification.
Shop Cups & Co on Amazon →Material
organic cotton
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Category baseline
period care is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
Safe base material
Made from a material with no inherent PFAS use (ceramic, mineral, or natural fiber).
The full breakdown
What it's made of and why it matters
This product is constructed from organic cotton, which eliminates synthetic polymer coatings that typically contain Teflon-type coating or other fluorinated water repellents. Organic certification requires absence of synthetic pesticides and certain heavy metals in dyes. The absorbent/leak-resistant layer composition is not publicly disclosed by Cups & Co; typical period underwear uses either cotton-polyester blends, polyurethane laminates, or proprietary moisture-barrier fabrics. Without full material transparency, the non-cotton components (gusset backing, elastic bands) cannot be fully assessed for phthalates, antimony, or flame retardants.
The brand's record and disclosure
Cups & Co provides organic cotton certification but does not publicly disclose full material specifications, manufacturing testing data, or formal statements on PFAS, azo dyes, or heavy metal limits in dyes and pigments. No major recalls or safety controversies are documented for this brand in public databases. The absence of transparency on water-resistance coatings and elastic components represents a disclosure gap typical of smaller period-product brands that lack third-party chemical testing documentation.
How it compares in its category
Organic cotton period underwear generally carries lower inherent hazard than synthetic-dominant alternatives (nylon, polyester blends) because the base fiber avoids antimony and azo-dye risks common in synthetic textiles. However, many competitors (Thinx, Knix, Modibodi) publicly commit to or disclose testing for PFAS, phthalates, and heavy metals, while Cups & Co remains silent. Period underwear as a category is not regulated as a medical device in most markets, creating minimal accountability for contaminant limits compared to menstrual pads or tampons.
If you buy it
Wash before first wear to remove any residual dyes or finishes. Machine wash in warm water with mild detergent; avoid bleach and fabric softeners, which can degrade water-resistance coatings and introduce additional chemicals. Hang dry or low heat tumble to prevent elastic and seam degradation. Replace when gusset shows visible thinning, seams fray, or moisture barrier fails (water no longer beads). Request full material composition from the brand if concerned about specific coatings or dyes; public pressure for transparency has shifted other brands toward disclosure.
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.”
Undisclosed water-resistance coatings
The mechanism that makes period underwear leak-resistant is not public; if polyurethane-based, it poses no known hazard, but if Teflon-family coating-treated or solvent-applied, risk is unquantified without testing data from the brand.
Azo dyes in colored cotton or elastic
Organic cotton certification limits but does not eliminate azo dyes; elastic bands (typically nylon or polyester) are not covered by organic rules and may contain azo dyes, though Cups & Co does not declare this as a known issue.
Heavy metals in pigments (including lead, cadmium)
Organic certification does not mandate heavy metal testing in dyes or pigments; no recalls or test results are documented for Cups & Co products, but brand lacks public commitment to metal limits.
Antimony in elastic or synthetic backing
Antimony is a catalyst in polyester and nylon production; if elastic bands contain conventional polyester, low-level antimony presence is plausible, but Cups & Co provides no material specification to confirm or rule out.
Formaldehyde-releasing finishes
Organic cotton and reputable wet-finishing typically avoid formaldehyde resins, but brand does not disclose finishing chemistry; wash before wear as a precaution reduces any residual finish exposure.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 78% 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 Period Underwear
JAMA Organic
LOLA Organic Cotton Period Underwear
Organic cotton with moisture-wicking gusset
Lower PFAS concern, organic cotton base with no waterproof claims, but brand doesn't explicitly address PFAS.
✓Verified PFAS-free by a third party
JAMA Organic
Organyc Certified Organic Cotton Disposable Period Underwear for Sensitive Skin
certified organic cotton with absorbent core
Lower concern, organic cotton base suggests minimal PFAS risk, but no explicit PFAS statement limits confidence.
✓Verified PFAS-free by a third party
Ruby Love
Women's Hipster Period Underwear
organic cotton with waterproof coating
Lower concern, PFAS-free verified; buy with confidence.
✓Lab test found no PFAS
More period underwear 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.