Saalt Leakproof Seamless Brief
Skip until coating transparency improves; waterproof textiles frequently use PFAS.
Undisclosed waterproof coatings in leakproof products commonly use Teflon-type coating or similar PFAS chemicals. Saalt offers no material breakdown or testing.
The better-graded swap
Aisle
Aisle Essential Period Hipster leakproof
90/100 safety
Same rubric that flunked this product. The swap earned Excellent.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Nylon/polyester blend with leak-proof coating (composition unspecified)
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What Saalt Leakproof Seamless Brief is made of, ingredients and materials
Saalt's brief combines nylon and polyester with an undisclosed leak-proof coating, the latter being the critical unknown. Nylon and polyester themselves are stable, inert synthetics with low leaching risk under normal wear. The coating is where hazard concentrates, waterproof textiles historically rely on Teflon-type coating (Teflon) or fluorocarbon compounds to repel menstrual fluid, and neither Saalt's website nor independent testing clarifies what their coating contains. Without transparency, you cannot rule out PFAS-based formulations.
What’s concerning
Category baseline
The starting point for this type of product, before anything specific to this product is counted.
No PFAS disclosure
No public statement from the brand about PFAS in this product.
Waterproof / stain-resistant treatment
Water-repellent coating treatments have historically used PFAS.
PFAS
Nylon-polyester blends with leak-proof coatings typically use PFAS or Teflon-type coating-adjacent compounds unless explicitly stated otherwise. Saalt's silence and the product's waterproof function both point to PFAS presence, though no laboratory confirmation is public.
Source, ATSDR ↗Azo dyes in nylon-polyester blend
Dark-colored period underwear often uses acid dyes (for nylon) and reactive dyes (for polyester). Restricted azo compounds can release carcinogenic amines if improperly manufactured, but Saalt provides no dye-restriction certification or testing. No incidents on record.
Antimicrobial finish (silver, triclosan, or quaternary ammonium)
Some period underwear brands add antimicrobials to control odor. Saalt does not disclose; if present and poorly bonded, these can migrate to skin. Typically lower concern but unverified for Saalt specifically.
Coating degradation and microparticle shedding
Waterproof coatings on textiles can flake with age and washing. Period underwear users report white residue in some brands after repeat laundering. Saalt's durability record is not published; inspect for coating loss and replace if visible wear appears.
What’s reassuring
Phthalates
Nylon and polyester do not require phthalates for function. If Saalt uses no additional PVC or soft plastic components, this risk is minimal; confirm packaging materials if concerned.
Source, ATSDR ↗How is this PFAS grade calculated?
The brand's record and disclosure
Saalt does not publicly disclose coating chemistry, certifications (OEKO-TEX, GOTS), or third-party testing for PFAS or other restricted substances. The brand markets sustainability but has not addressed the PFAS question directly despite industry awareness of the issue. No major recalls or contamination incidents are on record for Saalt period products, but silence on chemical composition is itself a red flag in this product category, where transparency is now table-stakes for premium brands.
How it compares in its category
Period underwear has split into two camps, brands disclosing PFAS-free coatings (Knix, Thinx as of 2023) and silent players like Saalt. Saalt positions as premium-eco, but lacks the third-party validation or open supply-chain detail that competitors have adopted. Nylon-polyester construction is standard; the difference is whether makers commit to and prove PFAS-free, antimicrobial-free, or certified-organic base materials.
If you buy it
Wash in cool or warm water (not hot; heat can degrade synthetic coatings and may increase leaching). Air dry only; machine heat voids the coating's warranty and life. Replace every 1 to 2 years depending on use frequency, as waterproof coatings degrade and lose efficacy. Do not bleach or use fabric softener. Before committing to a full pack, contact Saalt directly requesting coating composition and PFAS testing results; if they decline, that absence of response may guide your choice.
What is not known about PFAS in this product?
- Basis
- Model estimate, 42% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Saalt has made none
Formulations change between production runs, so check the current label. How we grade.
What are the PFAS-free alternatives to Saalt Leakproof Seamless Brief?
- organic cotton, waterproof backing layer
- A third party reports verifying it as PFAS-free
- Coating degradation and microparticle shedding
2 hazards checked on this product, all on its full breakdown.
- organic cotton blend, water-resistant gusset
- The brand calls it PFAS-free, which we have not verified
- Microplastic shedding from water-resistant barrier
- Organic cotton, wood pulp fiber
- The brand calls it PFAS-free, which we have not verified
- Azo dyes and synthetic dyes
2 hazards checked on this product, all on its full breakdown.
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.