Marks & Spencer · Sports Bras
Marks & Spencer Second Skin Gel Sports Bra
Skip until M&S discloses gel coating composition and water treatment.
Sports bra uses moisture-wicking gel and likely water-resistant treatment. M&S provides no PFAS disclosure; gel coating composition unknown. Higher caution advised without transparency.
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Material
nylon elastane blend with moisture-wicking gel coating
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
The Second Skin Gel Sports Bra is constructed from nylon and elastane (spandex) with a moisture-wicking gel coating applied to the fabric surface. Nylon and elastane themselves are well-established synthetic fibers with low hazard profiles when manufactured to standard; the real concern is the gel coating composition, which M&S has not publicly disclosed. Coatings on performance apparel often contain PFAS compounds (water and oil repellents) or other polymeric binders whose safety depends entirely on formulation and whether they migrate to skin during wear or washing.
The brand's record and disclosure
Marks & Spencer has not publicly disclosed the chemical composition of the gel coating used in this product, nor has the company published a comprehensive PFAS policy or commitment to phasing out these substances in textiles. The brand does not appear to hold third-party certifications (OEKO-TEX, BLUESIGN) for this specific product line that would verify restricted substance limits. M&S remains largely silent on performance fabric treatments, which is a notable gap compared to some competitors who openly specify fluorocarbon-free water repellency or publish restricted substance lists.
How it compares in its category
Sports bras with gel or moisture-wicking coatings are common; many mainstream brands (Nike, Adidas, Lululemon) similarly do not disclose coating chemistry for their performance lines. Certified alternatives exist from smaller brands using OEKO-TEX or GOTS-certified nylon-elastane blends without undisclosed coatings, or using mechanical moisture-wicking (pattern design) instead of chemical treatment. M&S's silence on gel composition places this product in the middle-to-lower transparency tier of the activewear market.
If you buy it
Wash separately or with similar colors to avoid dye bleeding (standard elastane care). Avoid high heat and tumble drying, which can degrade elastane and any coating; air dry is safest. Do not use fabric softeners or bleach, as these can damage both the elastane and the gel coating. If skin irritation develops, discontinue use immediately and consider that undisclosed coating components may be a trigger; in that case, request a refund and contact M&S for coating ingredient disclosure.
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 in finishing
No public recalls or test reports link M&S Second Skin to formaldehyde-releasing finishes. Standard nylon-elastane blends rarely require formaldehyde resins; however, the undisclosed gel coating remains a theoretical vector if it contains melamine or urea resins as binders.
Azo dyes
M&S does not publish restricted azo dye data for this product. Azo dyes are restricted under OEKO-TEX and EU regulations in apparel; if M&S sources compliant dyes (standard for UK retail), risk is low, but lack of certification leaves this unverified.
Coating degradation and skin contact
The undisclosed gel coating may shed microparticles or leach oligomers into sweat during wear or washing if the coating is not chemically stable. Nylon itself does not leach; the risk is specific to whatever polymer or fluorocarbon the gel comprises. This risk cannot be assessed without ingredient transparency.
Antimony in polyester (adjacent concern)
This bra is nylon-elastane, not polyester, so antimony catalyst residues are not applicable. Antimony is a documented concern only in polyester-based activewear.
Elastane degradation under UV and chlorine
Elastane fibers are known to degrade in sunlight, chlorine pools, and high heat. The gel coating may accelerate or mask this process. Replacement is typically recommended every 50-100 wears; the coating's durability is unknown and could shorten safe lifespan if it delaminates.
What we don’t know
This grade is a model-based estimate from public materials, coatings, and brand disclosure at 35% 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.
Safer alternatives in Sports Bras
Nike
Girls' Swoosh Sports Bra
nylon/polyester blend with elastane
Lower concern, basic athletic bra with no known PFAS treatment, but Nike provides no public disclosure.
⚠Risky category by default
Nike
Medium Support Sports Bra Nike Women's Swoosh
Nylon/polyester blend fabric, no waterproofing or stain treatment disclosed
Lower PFAS concern; standard sports bra with no waterproofing or chemical finishes typical of PFAS use.
⚠Risky category by default
Lululemon
Flow Y Sports Bras | Women's Bra Nulu Light Support, A–C Cups | Size 8 | Pink
Nulu (nylon blend)
Lower PFAS concern; natural fiber blend without performance coatings, but brand offers no transparency.
⚠Risky category by default
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.