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 safe swap
Lola
The Lola High Waist Period Underwear
100/100 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
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
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 safe 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 ↗The full breakdown
What it's made of and why it matters
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.
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 we don’t know
- 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.
Safer alternatives in Period Underwear
Modibodi
Basic Mid-Rise Period Brief
organic cotton blend with water-resistant coating
Water-resistant coating degradation
Limited concern
Microbial growth and odor with improper care
Limited concern
Lower concern. MADE SAFE certified, PFAS-free claimed and tested.
✓Lab test found no PFAS
Lola
The Lola High Waist Period Underwear
organic cotton with water-resistant treatment
Water-resistant coating degradation and microplastic shedding
Limited concern
Allergen sensitivity to cotton or treatment additives
Limited concern
Lower concern; PFAS-free certified, organic cotton base.
✓Lab test found no PFAS
Lola
Organic Cotton Period Underwear
organic cotton with gusseted absorbent layer
Formaldehyde / VOCs
Limited concern
Azo dyes and color fastness
Limited concern
Microplastic shedding
Limited concern
Lower concern. Organic cotton core, no water-resistant treatment disclosed.
⚠Risky category by default
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.