Amazon.com: saalt Reusable Period Underwear - Comfortable, Thin, and Keeps You Dry from All Leaks(Mesh Hipster, XX-Large
Skip until brand discloses water-repellent finish composition.
Saalt period underwear uses synthetic blends with moisture-wicking and leak-prevention treatments. Brand provides no PFAS disclosure or third-party verification of finish composition.
The better-graded swap
Lunapads
3-Pack BOOST Brief
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 blend with moisture-wicking treatment, unknown water-repellent finish
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What Amazon.com: saalt Reusable Period XX-Large is made of, ingredients and materials
Saalt period underwear is constructed from a nylon blend with a moisture-wicking treatment and an unspecified water-repellent finish. The nylon itself is a synthetic polymer with no inherent toxicity concern at skin contact, but the water-repellent finish is the critical unknown, manufacturers typically use PFAS-based chemistry (PFAS "forever chemicals") to achieve durable water resistance on textiles, though some brands are transitioning to PFAS-free alternatives. Without Saalt's disclosure of this finish chemistry, the PFAS risk cannot be assessed.
What’s concerning
Waterproof / stain-resistant treatment
Water-repellent coating treatments have historically used PFAS.
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.
PFAS
The undisclosed water-repellent treatment may contain PFAS compounds commonly used for durable moisture barrier on textiles. Dermal absorption risk is low during normal wear, but washing may release trace compounds into wastewater.
Source, ATSDR ↗Microplastics
Synthetic nylon fibers in intimate apparel may shed microplastics during repeated washing, particularly if pilling occurs or seams fray. Frequency and quantity are lower than in bulk synthetic garments but remain unquantified for this specific product.
Source, EPA ↗What’s reassuring
Formaldehyde / VOCs
No evidence that Saalt applies formaldehyde-based resins for wrinkle resistance or color-setting on this product; nylon blends typically require less formaldehyde treatment than cotton. However, unlabeled finish chemistry makes this unverifiable.
Source, ATSDR ↗Azo dyes
No specific information on dye chemistry for Saalt period underwear. Nylon takes dye well with modern non-azo alternatives, but brand does not specify testing against restricted azo compounds.
Skin irritation from synthetic contact
Nylon blends are widely tolerated against sensitive skin in menstrual products; no reported incidents specific to this brand. Irritation is more likely linked to fit, frequency of washing, or individual sensitivity to finish chemicals than the nylon fiber itself.
How is this PFAS grade calculated?
The brand's record and disclosure
Saalt has not publicly disclosed the chemical composition of its water-repellent treatment or provided certification from independent testing bodies (e.g., OEKO-TEX, GOTS) that would rule out PFAS. The brand's silence on this material detail is typical of many smaller direct-to-consumer menstrual-product brands, which often lack the supply-chain transparency larger apparel manufacturers now provide. No major recalls or established safety controversies involving this specific product have been published.
How it compares in its category
Most reusable period underwear on the market uses nylon or polyester blends with water-repellent finishes; Saalt's approach is standard for the category. Competitors such as Knix and Thinx have made public commitments to PFAS-free water-repellency (using wax or other technologies), setting a higher transparency bar that Saalt has not matched. Organic cotton or hemp-blend alternatives exist but typically offer less reliable leak protection without treatment.
If you buy it
Wash in cold water with mild detergent before first wear to reduce any residual finishing chemicals. Avoid high heat (tumble dry low or air dry) as synthetic blends degrade with heat and treatment compounds may volatilize. Replace when elastic loses elasticity or fabric pilling occurs, typically after 1-2 years of regular use. If you have sensitive skin or chemical sensitivities, contact Saalt directly to request documentation of the water-repellent finish; lack of response reinforces the case for choosing a brand with public PFAS commitment.
What is not known about PFAS in this product?
- Basis
- Model estimate, 35% 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 Amazon.com: saalt Reusable Period Underwear - Comfortable, Thin, and Keeps You Dry from All Leaks(Mesh Hipster, XX-Large?
- 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.