Gymshark Pants & Jumpsuits Gymshark Flex High Waisted Leggings
Lower concern; standard leggings with no known PFAS triggers.
Polyester-nylon blend without marketed water-repellent or stain-resistant finishes. No public evidence of PFAS-containing coatings on this conventional athletic product.
The better-graded swap
Vuori
Daily Pocket Legging
85/100 safety
Same rubric that flunked this product. The swap earned Excellent.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Polyester/nylon blend (standard athletic fabric)
Lab data
No public lab test
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What Gymshark Pants Waisted Leggings is made of, ingredients and materials
Gymshark Flex leggings are a polyester/nylon blend, the industry standard for moisture-wicking athletic wear. Polyester is a synthetic polymer that does not leach significant chemicals during normal wear or washing at typical temperatures. Nylon adds stretch and durability but shares polyester's chemical stability in garment form. Neither fiber sheds microplastics at rates that pose known acute risk during wear, though abrasion and repeated washing do shed fibers at minimal levels common to all synthetic textiles.
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.
Microplastic shedding during wear and laundering
All polyester garments shed microfibers; Gymshark Flex leggings will shed at rates typical for synthetic athletic wear. Shedding increases with age, washing, and friction, but remains at levels consistent with mainstream alternatives and poses no established acute health risk during normal use.
What’s reassuring
Base material not linked to PFAS
The main material recorded for this product is not one associated with PFAS.
Heavy metals
No recalls or test failures for Gymshark apparel involving restricted azo dyes or lead/cadmium in color additives have been documented. Industry-standard polyester and nylon fibers are dyed with colorfast processes that do not typically release heavy metals during wear or washing.
Source, FDA ↗Formaldehyde / VOCs
Polyester/nylon blends do not require formaldehyde-based wrinkle-resistance or antimicrobial treatments as part of standard athletic fabric finishing. No known formaldehyde contamination issues are associated with Gymshark products or this material type.
Source, ATSDR ↗Flame retardants
Yoga and athletic leggings are not classified as sleepwear or children's apparel and thus are not subject to mandatory flame-retardant regulations. Gymshark does not advertise flame-retardant treatment, and no evidence suggests its addition to this product category.
Source, EPA ↗Antimony in polyester fibers
Antimony is a known polyester catalyst residue, but levels in finished apparel are not regulated in most markets and typically do not migrate to skin during wear. No documented case of health effects from antimony in standard athletic leggings has been established.
How is this PFAS grade calculated?
The brand's record and disclosure
Gymshark is a UK-based activewear brand with no major safety recalls or documented chemical hazard controversies on record for apparel. The brand does not publicly disclose detailed chemical management policies, manufacturing certifications (such as OEKO-TEX or GOTS), or restricted substance lists, placing it in a middle position regarding transparency. No evidence of formaldehyde, heavy metal dyes, or antimony issues has surfaced in independent testing or regulatory notices. The brand's silence on PFAS use aligns with many mainstream athletic brands that do not market PFAS-free status.
How it compares in its category
Gymshark Flex leggings sit in the mainstream athletic segment, comparable to brands like Lululemon, Athleta, and Nike in material safety profile. Unlike premium brands (Patagonia, Allbirds), Gymshark does not emphasize third-party chemical certifications or publish restricted substance compliance reports. Unlike fast-fashion athletic brands (Old Navy, H&M activewear), Gymshark has not been flagged in independent textile safety audits. The polyester/nylon blend is less hazardous than cotton blended with heavy synthetic coatings or treated with durable water repellents.
If you buy it
Wash in cold water and air-dry to minimize any potential fiber shedding and preserve coating integrity; heat can slightly accelerate synthetic polymer degradation over many cycles. Replace leggings when seams fray, elastic degrades, or pilling becomes visible, as compromised fabric sheds more fibers. Machine-wash with standard detergent; no special protocols are needed unless the fabric shows coating wear. Store in a dry place to prevent mold or mildew growth, which can occur in any synthetic athletic fabric kept damp.
What is not known about PFAS in this product?
- Basis
- Model estimate, 68% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Gymshark 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 Gymshark Pants & Jumpsuits Gymshark Flex High Waisted Leggings?
- nylon/spandex blend, no disclosed coating
- We found no PFAS statement from the brand
- Heavy metals
2 hazards checked on this product, all on its full breakdown.
- nylon or polyester blend with elastane
- We found no PFAS statement from the brand
- Antimony in polyester fiber
3 hazards checked on this product, all on its full breakdown.
More yoga leggings 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.