Arc'teryx · Synthetic Athletic Wear
Arc'teryx Men's Gamma MX Breathable Softshell Hoody
Mid-risk, water-repellent coating treatment chemistry unknown; Arc'teryx silent on PFAS.
Gamma MX uses nylon/polyester softshell with water-repellent coating treatment typical of this category. Arc'teryx does not disclose whether PFAS-based water-repellent coating is used.
Still want this one anyway? Check the price on Amazon. We’d swap it.
Material
Nylon/polyester softshell with water-repellent coating treatment
Brand disclosure
Brand is silent on PFAS
Lab data
No public lab test
What’s concerning
Waterproof / stain-resistant treatment
Water-repellent treatments have historically contained PFAS chemicals.
Category baseline
PFAS exposure happens more often with clothing products.
No PFAS disclosure
The company has not publicly discussed PFAS in this product.
Azo dyes and restricted colorants
Arc'teryx does not publicly certify compliance with OEKO-TEX or bluesign standards, which would exclude carcinogenic azo dyes. The Gamma MX is available in multiple colors; without third-party audit, azo dye risk cannot be ruled out, though industry norms and brand positioning suggest low likelihood.
water-repellent coating treatment leaching and microfiber shedding
If the water-repellent coating treatment contains Teflon-type coating or legacy fluorocarbons, washing and wear shed microfibers coated with these substances into water systems. The unknown chemistry makes this a concern; silicone or hydrocarbon water-repellent coating alternatives carry lower environmental risk per wash.
What’s reassuring
Formaldehyde / VOCs
No recalls or public testing reports of formaldehyde in Arc'teryx softshells. Nylon and polyester dyeing can involve formaldehyde-releasing binders, but finished apparel typically has minimal residual formaldehyde if properly rinsed; no evidence specific to this model.
Source: ATSDR ↗Antimony in polyester
Polyester catalysts can contain antimony trioxide; most modern polyester (including Arc'teryx's likely suppliers) use antimony-free catalysts. No warnings or recalls exist for Arc'teryx polyester products on this issue.
Flame retardants
Softshells are not typically treated with added flame retardants unless marketed for specific hazard use (climbing, firefighting). The Gamma MX is a general-purpose breathable hoody; no evidence of halogenated or organophosphate flame retardants in its construction.
Source: EPA ↗The full breakdown
What it's made of and why it matters
The Gamma MX combines nylon and polyester in a softshell weave, treated with a water-repellent coating (water-repellent coating) finish to shed moisture. Softshells prioritize breathability over waterproofing, making them useful for active wear, but water-repellent coating chemistry varies widely across manufacturers. Arc'teryx does not publicly specify which water-repellent coating chemistry they use on this garment (Teflon-type coating-based, silicone-based, or fluorocarbon-free alternatives remain unclear). The base nylon and polyester themselves are not acute hazards in finished form, but the surface treatment is the variable of concern.
The brand's record and disclosure
Arc'teryx is a premium outdoor gear maker owned by Salomon/Amer Sports. The brand has not published public statements on PFAS phase-out commitments or water-repellent coating chemistry transparency, despite industry pressure from environmental groups. No major recalls or contamination incidents involving this specific hoody are on record. Arc'teryx does not currently list PFAS-free certifications (such as OEKO-TEX or bluesign) for their softshell line, and transparency remains limited compared to peer brands like Patagonia.
How it compares in its category
Most outdoor softshells in this price range (premium category) use some form of fluorinated water-repellent coating treatment; truly PFAS-free alternatives exist but are less common at Arc'teryx's performance tier. Brands like Patagonia and some Japanese manufacturers now offer softshells with fluorocarbon-free water-repellent coating. The Gamma MX's omission of public water-repellent coating disclosure places it in a middle zone: not transparently phased out, but not aggressively marketed with legacy chemistry either. For breathability and abrasion resistance, the nylon/polyester blend is standard and unremarkable.
If you buy it
Wash separately in cool water with mild soap, avoiding fabric softeners and high heat; tumble dry on low or air dry to prevent water-repellent coating damage and reduce microfiber shedding. Do not iron or expose to temperatures above 60°C. Replace the hoody when seams fail, zippers jam, or breathability noticeably declines, typically after 3-5 years of heavy use. Store dry to prevent mildew and odor.
What we don’t know
- Basis
- Model estimate, 45% confidence, not a lab result
- Lab test
- None on record for this exact product
- Brand statement
- Arc'teryx has made none
Formulations change between production runs, so check the current label. How we grade.
Safer alternatives in Synthetic Athletic Wear
Arc'teryx
Men's Cormac Logo Shirt
100% polyester knit, no water-repellent treatment
Heavy metals
Limited concern
Antimony in polyester
Limited concern
Microplastic shedding
Moderate concern
Lower concern, basic polyester shirt with no water-repellent coating finish.
⚠Risky category by default
HOKA
Men's Race Day Singlet
polyester mesh and fabric
Heavy metals
Limited concern
Formaldehyde / VOCs
Limited concern
Microplastic shedding on wear and wash
Moderate concern
Antimony in polyester polymer
Limited concern
Lower concern, no waterproofing or water-repellent coating treatment typical for race singlets.
⚠Risky category by default
HOKA
Men's Race Day Singlet Crew Neck Running Tank top
Polyester/nylon blend athletic knit, no disclosed water-repellent coating or stain treatment
Antimony in polyester
Limited concern
Microplastic shedding
Limited concern
Minimal concern; no performance coatings on this running tank.
⚠Risky category by default
More synthetic athletic wear 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.