lululemon Flow Y Sports Bras Women's Bra Nulu Light Support, A, C Cups
Lower PFAS concern; natural fiber blend without performance coatings, but brand lacks transparency.
Lululemon's Nulu nylon blend has no disclosed water-repellent or stain-resistant treatment, reducing typical PFAS risk pathways. The brand doesn't publicly disclose PFAS policies or testing.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Nulu (nylon blend)
Lab data
No public lab test
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What lululemon Flow Y Sports Bras A, C Cups is made of, ingredients and materials
Nulu is Lululemon's proprietary nylon-blend fabric, typically a four-way stretch composed primarily of nylon with a small percentage of spandex (elastane). Unlike performance fabrics with water-repellent or antimicrobial coatings, Nulu has minimal wet-finish treatments, which reduces leaching hazards from durable water repellents or antimicrobial agents. The lightweight construction and absence of heavy stabilizers also lower the risk of formaldehyde-based resins used in shape retention.
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.
Azo dyes and synthetic colorants
Nulu pink colorant composition is not disclosed; azo dyes are common in synthetic athletic wear and can release aromatic amines under sweat or heat stress. Lululemon does not publish dye-class certifications for this product.
Spandex degradation and microfiber shedding
Nylon-spandex blends naturally shed microfibers during washing and wear, a known environmental and ingestible concern. This bra is not uniquely prone to shedding but contributes to cumulative microplastic burden with each wash cycle.
Contact dermatitis and fragrance/dye sensitivity
Residual dyes, mordants, or finishing agents can trigger skin irritation in sensitive wearers; Lululemon does not label fragrance-free or hypoallergenic claims. Patch testing on inner arm before extended wear is advisable for individuals with known textile sensitivities.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Formaldehyde / VOCs
Nulu's minimalist construction does not typically require heavy resin stabilizers, and no formaldehyde-based finishing is standard for this fabric type. No reported residue detected in published third-party testing of comparable Nulu items.
Source, ATSDR ↗Heavy metals
Lululemon apparel has not been flagged in public testing or recalls for cadmium, lead, or chromium contamination. Standard nylon dyeing does not typically introduce heavy metals, though trace elements can vary by supplier.
Source, FDA ↗How is this PFAS grade calculated?
The brand's record and disclosure
Lululemon does not publicly disclose detailed chemical testing or third-party certifications (e.g., OEKO-TEX, bluesign) for most products, including this bra. The brand has faced no major recalls or documented chemical contamination incidents for apparel in the U.S. market. Lululemon's sustainability reports focus on environmental supply-chain practices rather than chemical safety detail, leaving PFAS use and other synthetic residues opaque.
How it compares in its category
Sports bras in the premium segment (Lululemon, Athleta, Outdoor Voices) typically use similar nylon-spandex blends without performance coatings, putting this bra in a lower-chemical-risk position compared to bras marketed with moisture-wicking or antimicrobial finishes. Budget brands sometimes use heavier fabric treatments to achieve performance claims; Lululemon's Nulu avoids this. However, transparency on dye chemistry and residual solvents remains limited across most athletic-apparel makers, including Lululemon.
If you buy it
Wash in cool water with mild detergent before first wear to reduce any residual dyes or finishes; avoid bleach and fabric softeners, which can degrade the nylon-spandex elasticity. Do not machine dry or expose to direct heat above 130F (54C), as nylon can warp and release volatile compounds under stress. Replace when the waistband loses elasticity, seams fray, or the fabric develops pilling that cannot be removed, typically after 1-2 years of regular use. Store in a cool, dry place away from direct sunlight to prevent dye fading and material degradation.
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
- Lululemon 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.