· Swimwear
Dasha One Piece
Lower concern for PFAS, but the brand offers no transparency on water-repellent coating treatments or material sourcing.
Dasha One Piece is a nylon swimsuit; nylon itself carries minimal PFAS risk. However, swimwear often uses water-repellent coating finishes that may contain PFAS. Doesn't publicly disclose whether this suit uses PFAS-based water-repellent coating treatments.
The better-graded swap
Patagonia
Patagonia Women's Bottom Turn Racerback Bikini Top
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/polyamide swimwear fabric
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What Dasha One Piece is made of, ingredients and materials
The Dasha One Piece is nylon/polyamide swimwear, a synthetic fiber chosen for durability, stretch, and chlorine/saltwater resistance. Nylon itself does not leach harmful chemicals into skin or water during normal wear. The main concern in nylon textiles is the dyes and finishing treatments applied during manufacturing, not the base polymer.
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.
Azo dyes and synthetic colorants
Nylon swimwear is typically dyed with reactive or disperse dyes; The brand does not disclose dye chemistry or testing. Azo dyes in textiles can theoretically release aromatic amines under certain conditions, but this risk is low in finished, rinsed swimwear worn briefly against skin.
Heavy metals
Dark or vivid colors in synthetic dyes can occasionally contain trace heavy metals (cadmium, lead) as pigment impurities. The brand does not publish heavy metal testing. Risk to skin contact is minimal given the small surface area and brief exposure time; no recalls or complaints are on record.
Source, FDA ↗Elastic degradation and microfiber shedding
Nylon elastane blends (common in swimwear) gradually shed microfibers with wear and washing. This is an environmental concern rather than a direct human health hazard, but consumers should be aware that this product contributes to microplastic load over its lifetime.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Formaldehyde / VOCs
No formaldehyde-based finishing treatments have been reported for products. Nylon swimwear typically does not require formaldehyde resin hardening; this hazard is more common in cotton blends and structured garments.
Source, ATSDR ↗Irritant residues from manufacturing or finishing
The brand does not publish wash-before-wear guidance or residue testing data. Standard practice is to rinse new swimwear before use to remove sizing and dye residues, which is adequate for nylon garments at this price point.
How is this PFAS grade calculated?
The brand's record and disclosure
The brand is a smaller, luxury swimwear label without publicly available sustainability certifications (Oeko-Tex, GOTS) or detailed chemical disclosure on their website. The brand has not faced major recalls or documented chemical safety controversies. Their silence on water-repellent coating (water-repellent coating) treatments and material sourcing leaves questions about finishing chemicals, though standard nylon swimwear rarely requires heavy water-repellent coating application.
How it compares in its category
Nylon one-pieces are the industry standard and perform similarly across brands in chemical hazard profiles. Unlike polyester blends (which may contain antimony), pure nylon avoids that concern. Compared to natural alternatives like wool or linen swimwear, nylon offers similar or lower risk profiles for typical hazards, though certification status is often lower among luxury labels than mass-market brands.
If you buy it
Rinse thoroughly in fresh water after each salt or chlorine use to remove residual chemicals and extend fabric life. Avoid high-heat drying; air-dry or low heat to prevent elastic degradation. Replace when elasticity noticeably declines (typically 1-2 years with regular use). Hand wash gently with mild detergent; avoid bleach, which can break down nylon and release dyes.
What is not known about PFAS in this product?
- Basis
- Model estimate, 62% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- has made none
Formulations change between production runs, so check the current label. How we grade.
What are the PFAS-free alternatives to Dasha One Piece?
- Nylon/polyester blend with elastane (standard swimwear)
- The brand calls it PFAS-free, which we have not verified
- Elastane (spandex) degradation under heat or chlorine
More swimwear 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.