Nike · Waterproof Sports Undergarments
Nike Women's Swift High Support Sports Bra
Likely lower concern, but Nike silent on PFAS in apparel.
Sports bra uses nylon/polyester with water-repellent coating, common in athletic wear. Nike has not disclosed PFAS use or absence in this product line.
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Material
nylon, polyester blend with water-repellent coating finish
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
Why this grade
Waterproof / stain-resistant treatment
water-repellent coating treatments have historically used PFAS.
Category baseline
clothing is a category where PFAS exposure is more common.
No PFAS disclosure
No public statement about PFAS in this product.
The full breakdown
What it's made of and why it matters
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.
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.
Beyond PFAS: other things we checked
Established hazard classes for this product type, assessed from public information. These never change the PFAS grade; a Likely flag caps the Verdict at “Buy with care.”
Formaldehyde resins (dyes and finish cross-linking)
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 are not documented to exceed safe off-gassing thresholds in normal wear or after standard washing.
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.
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.
Flame retardants or other finish additives
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.
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 we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 45% confidence. It is not a lab result.
No independent PFAS lab test is on record for this exact product. A lab test could move the score in either direction.
The brand has not made a specific, verifiable PFAS-free statement, so part of this score reflects that missing disclosure rather than a confirmed material.
Formulations and coatings change between production runs. Always check the current label before buying.
More 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.