Nike · Waterproof Sports Undergarments
Nike Women's Swift Breathe Dri-FIT Running Tank Top
Athletic tank with likely water-repellent coating finish; Nike silent on PFAS.
Nike's Dri-FIT technology typically uses moisture-wicking coatings, often fluorinated, but Nike shares nothing publicly about PFAS. No testing data is available.
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Material
Polyester blend with Dri-FIT moisture-wicking finish
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
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.
water-repellent coating (water-repellent coating) fluorochemical finish
Nike's Dri-FIT moisture-wicking function in athletic tanks typically requires water-repellent coating; standard polyester athletic apparel relies on fluorinated compounds for water and sweat repellency. Nike has not disclosed PFAS-free alternatives for this product line.
Formaldehyde / VOCs
Polyester apparel may contain residual formaldehyde from reactive dyes or wrinkle-resist finishes applied during manufacturing. Nike does not publicly test or disclose formaldehyde content for this product. Standard washing reduces residual levels, but new garments may off-gas slightly.
Source, ATSDR ↗Coating degradation and microplastic shedding over time
Repeated washing and wear cause water-repellent coating coatings to wear off polyester fibers. As the coating degrades, small fragments of treated polymer may be shed in wash water or through abrasion; full life-cycle microplastic contribution is not quantified by Nike or third parties.
What’s reassuring
Antimony in polyester fiber
Polyester synthesis uses antimony trioxide as a catalyst, which remains trace-bonded in the finished fiber. For intact garments worn normally, dermally available antimony is considered negligible by toxicology consensus, though some advocacy groups recommend minimizing contact with heavily pilled or degraded polyester.
Heavy metals
Nike adheres to industry restricted substance lists (RSL) that prohibit many azo dyes and cadmium/lead pigments in apparel. No specific testing or safety data is published for this tank, but compliance is standard for Tier 1 athletic brands in most geographies.
Source, FDA ↗The full breakdown
What it's made of and why it matters
This tank is polyester blend with Nike's Dri-FIT finish, a moisture-wicking technology that moves sweat away from skin. Polyester itself is a stable plastic polymer, but the 'finish' applied to enable water and sweat repellency is the concern, athletic brands routinely apply fluorinated water-repellent coating (water-repellent coating) coatings to maintain performance through repeated washing. Dri-FIT's exact chemistry is proprietary, but industry standard suggests fluorochemical treatment. The polyester fiber also typically contains trace antimony (a catalyst used in synthesis), though at levels generally below concern for intact garments.
The brand's record and disclosure
Nike has not publicly disclosed PFAS use or phase-out timelines for its athletic apparel lines as of 2024. The company has faced pressure from environmental groups on 'forever chemicals' in footwear and textiles but remains silent on specific product reformulation. Nike does publish sustainability reports but does not itemize PFAS testing, use, or restricted substance lists at the consumer level for most apparel. No product-specific safety recalls for this tank exist on record.
How it compares in its category
Athletic moisture-wicking tanks from major brands (Nike, Adidas, Brooks) commonly use polyester with water-repellent coating finishes; nearly all rely on some form of fluorochemical or alternative water-repellent chemistry. Few brands publicly commit to PFAS-free alternatives in this category, as water-repellent coating performance is tied to fluorine persistence. Brands offering PFAS-free sports apparel are still niche (e.g., some Patagonia, outdoor specialists), and cost typically 20-40% higher. This product sits in the mainstream athletic segment where PFAS presence is the norm, not an outlier.
If you buy it
Wash in cold water (below 60°C/140°F) and avoid fabric softeners or high heat drying, as heat and surfactants can degrade the water-repellent coating and potentially increase leaching of finish chemicals. Air-dry when possible. The garment does not need frequent washing; wear 3-4 times between washes to reduce cumulative wear and chemical exposure. Inspect for pilling, coating breakdown, or odor retention after 2 years; heavy users may see performance decline sooner. Do not bleach or dry-clean, as these solvents interact with applied finishes.
What we don’t know
- Basis
- Model estimate, 62% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Nike has made none
Formulations change between production runs, so check the current label. How we grade.
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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.