Nike · Waterproof Sports Undergarments
Nike Women's Swift High Support Sports Bra
Likely lower concern, but Nike silent on PFAS in apparel.
This sports bra uses nylon and polyester with water-repellent coating common in athletic wear. Nike hasn't disclosed PFAS use or avoidance.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
nylon, polyester blend with water-repellent coating finish
Lab data
No public lab test
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What Nike Women's Swift High Support Sports Bra is made of, ingredients and materials
This bra uses a nylon and polyester blend, common in performance athletic wear for stretch, moisture-wicking, and durability. The water-repellent coating (water-repellent coating) finish is applied to the outer surface to shed sweat and water without waterproofing the fabric completely. Polyester itself is chemically stable in wear; nylon similarly poses minimal hazard during normal use. The water-repellent coating finish is where PFAS concern enters, but that is graded separately in your PFAS assessment.
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.
Antimony in polyester
Antimony trioxide is a catalyst used in polyester production and can remain in trace amounts in the finished fiber. Dermal contact with antimony during wear is not established as a health pathway; levels are typically far below ingestion thresholds. No recalls specific to Nike apparel for antimony leaching.
Microfiber shedding during wash
All synthetic textiles shed microfibers when laundered, particularly polyester. A sports bra contributes to this category but is not a primary source. Use a microfiber-catching laundry bag or wash in cold water with minimal agitation to reduce shedding. This is an environmental rather than direct-to-wearer hazard.
What’s reassuring
Formaldehyde / VOCs
No recalls or test failures on record for Nike apparel in this product line. Nylon-polyester blends used in sports bras typically undergo standard dyeing and water-repellent coating application that may involve trace formaldehyde, but finished products show lower concern for off-gassing in normal wear or after standard washing.
Source, ATSDR ↗Azo dyes (colorant hazard)
Nike apparel is covered by RSL restrictions on certain banned azo dyes that cleave to form amines. No specific failures for women's sports bras are documented. Polyester-nylon blends are routinely tested for azo compliance; this product shows no red flags.
Flame retardants
Sports bras are not classified as furniture or heavy textiles subject to flame retardant regulations. Nike does not publish use of halogenated flame retardants in apparel. Standard water-repellent coating finishes (likely PFAS-based, graded separately) are the primary additive of concern.
Source, EPA ↗How is this PFAS grade calculated?
The brand's record and disclosure
Nike has not published detailed chemical disclosure or PFAS phase-out commitments for apparel, despite doing so selectively for footwear. The brand has faced scrutiny over supplier environmental practices but no major recalls for formaldehyde, azo dyes, or heavy metals in recent apparel. Nike is a signatory to the Restricted Substances List (RSL) used across the footwear and apparel industry, which limits but does not eliminate use of certain dyes and finishes.
How it compares in its category
Sports bras in this price and performance tier typically use the same nylon-polyester-water-repellent coating formula; this is industry standard. Competitors like Adidas and Lululemon face similar PFAS ambiguity in performance apparel. Fully synthetic alternatives (polyester-only) avoid some dye and finish complexity but still carry water-repellent coating risk. Organic cotton sports bras eliminate dye and finish hazards but sacrifice moisture-wicking and durability.
If you buy it
Wash in cool water and mild detergent; high heat or bleach can degrade the water-repellent coating finish and potentially release finish residues. Air dry rather than machine drying. The bra does not require special chemical stripping or pre-washing before wear. Replace when elastic degrades (typically after 50-100 washes) rather than waiting for visible damage, as degraded elastic reduces support and may shed fibers.
What is not known about PFAS in this product?
- Basis
- Model estimate, 45% 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.
What are the PFAS-free alternatives to Nike Women's Swift High Support Sports Bra?
- Cotton-blend knit jersey, uncoated
- We found no PFAS statement from the brand
- Azo dyes and synthetic colorants
3 hazards checked on this product, all on its full breakdown.
Find an alternative on Amazon
- cotton jersey, no applied finish
- We found no PFAS statement from the brand
- Azo dyes and colorant residues
2 hazards checked on this product, all on its full breakdown.
Find an alternative on Amazon
- 100% cotton jersey knit, untreated
- We found no PFAS statement from the brand
- Azo dyes
2 hazards checked on this product, all on its full breakdown.
Find an alternative on AmazonMore waterproof sports undergarments 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.