Andie Women's The Betina One-Piece Swimsuit
Moderate concern, swimwear water-repellent coating source unknown; Andie offers no PFAS transparency.
Andie's Betina swimsuit likely uses a water-repellent coating on its nylon/spandex fabric, a common practice in swimwear. Andie provides no public disclosure about their coating chemistry or PFAS status.
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/spandex blend with water-repellent coating finish
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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What Andie Women's The Betina One-Piece is made of, ingredients and materials
The Betina is a nylon and spandex (elastane) blend with a water-repellent coating (water-repellent coating) finish. Nylon itself is a stable synthetic polymer with low leaching risk in normal use. Spandex adds stretch and recovery but can degrade over time with heat and chlorine exposure. The water-repellent coating is the concern here, this finish keeps water beading off the fabric, but the chemical composition is not disclosed by Andie, and water-repellent coating finishes historically have relied on PFAS compounds (addressed separately). Without transparency, the source and durability of this specific water-repellent coating treatment remains unclear.
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.
Spandex (elastane) degradation
Chlorine, salt, heat, and UV are known to degrade spandex fibers over time. Degradation releases microscopic elastane fragments into water and sweat. No specific data on Andie's spandex quality, but this is inherent to all spandex swimwear; rate of loss varies by product durability.
water-repellent coating degradation and leaching
The Betina's water-repellent coating finish will eventually degrade with use and washing. If PFAS-based (unconfirmed), degradation could release compounds into wash water and environmental runoff. Andie provides no information on water-repellent coating chemistry, formulation longevity, or disposal impact.
Azo dyes and colorant allergens
The Betina is available in multiple colors. If azo dyes are used without restriction, some individuals with sensitive skin or dye allergies may experience contact dermatitis. No specific color-safety data for Andie swimwear is publicly available; risk is typical for mass-market swimwear.
What’s reassuring
Formaldehyde / VOCs
No public reports of excessive formaldehyde in Andie swimwear or nylon/spandex textiles in this product category. Formaldehyde resins are more common in performance apparel with wrinkle-resistance claims, which the Betina does not advertise.
Source, ATSDR ↗Antimony in polyester components
Antimony is used as a catalyst in polyester production but is not relevant here, as the Betina is nylon and spandex, not polyester. No antimony hazard applies to this specific product.
The full breakdown
The brand's record and disclosure
Andie has not published publicly available information about PFAS use, chemical sourcing, or sustainability certifications for this product. The brand does not appear to hold third-party certifications such as Bluesign, GOTS, or Oeko-Tex Standard 100, which would provide independent verification of restricted substances. No major recalls or documented safety incidents involving Andie swimwear have been reported in public records. The silent stance on PFAS is noteworthy given the category-wide concern.
How it compares in its category
Most mainstream swimwear brands (Speedo, TYR, Lands' End) similarly use nylon/spandex and typically do not disclose water-repellent coating chemistry. Brands with stronger transparency include Patagonia (Bluesign certified) and a few smaller makers using PFOA-free or fluorocarbon-free water-repellent alternatives. The Betina occupies the middle market where water-repellent coating is standard but chemical accountability is minimal. Price point and material durability are competitive; chemical transparency is below best-in-class.
If you buy it
Rinse thoroughly after each saltwater or chlorine use to extend fiber life and remove degradation byproducts. Avoid high heat when drying (air dry preferred; no dryer). Replace when elastic loses recovery, seams weaken, or water-repellent coating visibly deteriorates (typically 2-3 years of regular use). Do not expose to direct sunlight for extended periods, as UV degrades elastane. Wash in cool water with mild detergent, and avoid fabric softeners and bleach.
What we don’t know
- Basis
- Model estimate, 45% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Andie has made none
Formulations change between production runs, so check the current label. How we grade.
Better-graded alternatives in Swimwear
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- 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
Solid & Striped
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2 hazards checked on this product. See all of them.
Find an alternative on Amazon
Adidas
Women's Mexicana Florals Tie-Back Swimsuit
- Polyester/nylon swimsuit fabric, likely uncoated or standard finish
- Azo dyes and synthetic colorants
4 hazards checked on this product. See all of them.
Find an alternative on AmazonMore 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.