Medium Support Sports Bra Nike Women's Swoosh
Lower concern for a sports bra with no disclosed water-repellent or stain-resistant finishes.
The nylon and polyester blend has no waterproofing or stain treatment on record, which are typical PFAS application points in apparel. Nike has no PFAS statement on record for this product.
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Material
Nylon/polyester blend fabric, no waterproofing or stain treatment disclosed
Lab data
No public lab test
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What Medium Support Sports Bra Women's Swoosh is made of, ingredients and materials
This bra uses a nylon-polyester blend, both synthetic polymers chosen for stretch, durability, and moisture-wicking in active wear. Neither material requires waterproofing or stain-resistant chemical treatments, which is favorable because those coatings often contain PFAS. The blend itself poses no inherent leaching risk under normal wear and washing conditions; nylon and polyester are inert once polymerized and do not shed microplastics in typical sports-bra use.
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.
Formaldehyde / VOCs
Nylon-polyester textiles sometimes use formaldehyde-based dye fixatives or wrinkle-resist treatments. Nike does not disclose finishes for this product; standard industry practice suggests low probability given no waterproofing claim, but cannot be ruled out without testing.
Source, ATSDR ↗Heavy metals
Synthetic textiles may use azo dyes (some banned in EU but permitted in US) or heavy metals in pigments. Nike's MRSL restricts certain azo dyes but does not guarantee product-specific compliance. No incidents reported for this model.
Source, FDA ↗Microplastic shedding during use
Nylon-polyester blends can shed microfibers during washing, though the amount is small for most users. This is an environmental concern rather than a direct health hazard and is not unique to Nike or this model.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Antimony in polyester
Polyester may contain antimony as a catalyst during manufacturing, but residual levels post-polymerization are negligible and not a known concern for apparel contact. No evidence of elevated antimony in Nike textiles.
Flame retardants
Sports bras are not typically treated with flame retardants because they are not classified as sleepwear or furniture. This product shows no evidence of such treatment.
Source, EPA ↗How is this PFAS grade calculated?
The brand's record and disclosure
Nike has faced scrutiny over chemical use in textiles and has committed to phasing out certain hazardous substances under its Manufacturing Restricted Substances List (MRSL), though detailed supply-chain transparency remains limited. The company does not publicly disclose formaldehyde resin finishes, dye standards, or antimony content for individual products. No recalls or safety violations specific to the Swoosh sports-bra line are on record. Nike's silence on PFAS in apparel is consistent with industry norms; the absence of waterproofing claims on this model suggests PFAS-free construction.
How it compares in its category
Sports bras in this segment typically use nylon-polyester blends without specialty finishes; this product is standard for the category. Competitors like Adidas, Lululemon, and Athleta follow similar material profiles. The lack of water-repellent coating distinguishes it favorably from outdoor/rain-specific athletic wear, which often contains PFAS. No major brand in mid-range sports wear has differentiated itself meaningfully on formaldehyde or dye safety disclosure.
If you buy it
Wash in cold water and avoid high heat or chlorine bleach, which can degrade elastic and synthetic fibers faster. Line-dry to preserve shape; machine drying accelerates wear. Replace when elastic loses support, typically after 12-24 months of regular use. Inspect for pilling or abrasion that could theoretically expose inner fibers, though this is cosmetic rather than a safety concern.
What is not known about PFAS in this product?
- Basis
- Model estimate, 72% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Nike has made a specific claim
Formulations change between production runs, so check the current label. How we grade.
More sports bras 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.