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PFAS in Rain Pants: Which Brands Grade Best and Worst

After analyzing publicly available material disclosures and manufacturing practices across leading rain pant brands, we find a sobering pattern: all major rain pant lines in our current database carry elevated PFAS concern grades. No product reviewed achieves a passing score. However, within this landscape of concern, Cotopaxi Ambato Wide Leg Pant (Women's) and its sister styles represent lower concern relative to competitors, earning a grade of F with a 55/100 safety estimate—our model-based calculation from materials and public disclosure, not a lab test. Meanwhile, technical rain pant specialists like Arc'teryx Beta Pant (GORE-TEX) score critically low at 5/100, reflecting heavy reliance on fluoropolymer waterproof membranes known to require PFAS chemistry in their manufacture.

This guide cuts through marketing claims to show you where rain pant PFAS risk concentrates, which brands disclose transparently, and why "waterproof" and "fluorocarbon-free" are rarely compatible statements. Based on available materials and data, we rank 15 products across four major outdoor and heritage brands. The findings challenge the assumption that premium or eco-conscious labels automatically mean lower PFAS exposure. Read on to understand what you're actually wearing—and what questions to ask before you buy.

Quick Comparison Table

Product	Brand	PFAS Grade	Safety Score	Verdict
Cotopaxi Ambato Wide Leg Pant (Women's)	Cotopaxi	F	55/100	Lower concern (relative); minimal public PFAS disclosure
Cotopaxi Salto Ripstop Pants (Men's)	Cotopaxi	F	55/100	Lower concern (relative); ripstop weave may reduce PFAS coating need
Cotopaxi Subo Pants (Women's)	Cotopaxi	F	55/100	Lower concern (relative)
Wrangler Wyoming Trail Jogger (Men's)	Wrangler	F	55/100	No disclosed PFAS policy; heritage denim brand
Wrangler Westside Trail Pants (Men's)	Wrangler	F	55/100	No disclosed PFAS policy
Wrangler All Terrain Cargo Pants (Men's)	Wrangler	F	55/100	No disclosed PFAS policy
Wrangler Cliff Side Utility Pants (Men's)	Wrangler	F	55/100	No disclosed PFAS policy
prAna Halle Straight Pants (Women's)	prAna	F	55/100	Sustainability brand; no public PFAS commitment
prAna Stretch Zion Cinch Pants (Women's)	prAna	F	55/100	Sustainability brand; no public PFAS commitment
prAna Halle Pant (Women's)	prAna	F	55/100	Sustainability brand; no public PFAS commitment
Patagonia Torrentshell 3L Pants (Women's)	Patagonia	F	45/100	Premium rain pant; fluorocarbon DWR typical in 3L constructs
Patagonia Torrentshell 3L Pants (Men's)	Patagonia	F	20/100	Premium rain pant; known fluorocarbon DWR use
The North Face Kids' Antora Rain Pants	The North Face	F	20/100	Child-sized; likely fluorocarbon finish
GORE-TEX Rain Pants (Generic)	GORE-TEX	F	25/100	PTFE membrane; PFAS chemistry integral to construction
GORE-TEX Dutch Army Trousers (W38–40 L31)	GORE-TEX	F	10/100	Military surplus; PTFE membrane with heavy use history
Arc'teryx Beta Pant (Men's, GORE-TEX)	GORE-TEX / Arc'teryx	F	5/100	Highest concern: Technical triple-layer PTFE membrane, fluorocarbon DWR

Understanding PFAS in Rain Pants

Per- and polyfluoroalkyl substances (PFAS) are used in rain pants primarily through two mechanisms: durable water repellent (DWR) coatings applied to fabric surfaces, and fluoropolymer membranes (like PTFE/GORE-TEX) that form the waterproof layer. Because PFAS chemicals resist water and oil, they are chemically efficient at creating durable hydrophobic finishes. However, the same chemical persistence that makes them effective waterproofing agents raises environmental and health concern; PFAS bioaccumulate and are detected in human blood serum across population studies. Association between PFAS exposure and health outcomes such as liver enzyme changes and immune suppression has been documented in epidemiological research, though association is not causation and individual risk depends on exposure dose and duration.

When you review rain pants on this site or others, you will encounter three distinct PFAS scenarios:

Traditional fluorocarbon DWR: Long-chain PFOA and PFOS, largely phased out post-2013 but still present in older inventory. The brand Patagonia states a commitment to fluorocarbon-free DWR on new lines, but legacy stock and supplier inconsistency remain common.
Short-chain fluorocarbon DWR: GenX and similar compounds marketed as "safer" alternatives. These are still PFAS and still persist in the environment, though they have shorter carbon chains.
PTFE membrane technology (GORE-TEX, eVent, Shakedry): The membrane itself is PTFE—a fluoropolymer. Manufacture requires PFAS processing agents; the finished membrane is a solid polymer but residual PFAS and processing by-products remain embedded in the yarn. This is chemically difficult to avoid without abandoning the membrane technology entirely.

None of the products in our database are labeled "PFAS-free" by their manufacturers. No evidence of PFAS-free rain pants has been found in reviewed sources among technical waterproof garments in current mass production. Brands claiming "PFAS-free" or "fluorocarbon-free" typically refer only to the DWR coat, not to membrane PFAS, and those claims remain largely unverified by independent third-party lab testing in publicly available data.

The Lower-Concern Option: Cotopaxi (Grade F, 55/100)

Cotopaxi Ambato Wide Leg Pant (Women's), Cotopaxi Salto Ripstop Pants (Men's), and Cotopaxi Subo Pants (Women's) all score 55/100—the highest in our database, though still a failing grade under conventional safety benchmarks. This reflects our model-based estimate from materials and public disclosure, not a lab test.

Why Cotopaxi edges ahead: The brand is newer (founded 2013) and markets itself as sustainability-focused. While Cotopaxi has not published a formal PFAS elimination commitment, the company's material specs emphasize ripstop weaves and lightweight nylon constructions that may require less intensive DWR coating than heavier technical rain shells. The Salto Ripstop style, for instance, uses a nylon-ripstop blend that offers inherent tear resistance, potentially reducing reliance on heavy fluorocarbon finishing. However, Cotopaxi does not disclose DWR chemistry on its website or product tags, so this assessment is an inference from construction, not verified fact.

Pros: Lighter weight; lower cost than GORE-TEX alternatives; ripstop construction durable; company ethos suggests sustainability awareness.

Cons: Zero published PFAS policy; DWR chemistry unknown; not marketed as waterproof (more water-resistant); no third-party lab testing disclosed.

Mid-Range Uncertainty: Wrangler and prAna (Grade F, 55/100)

Wrangler and prAna rain pants occupy the same 55/100 zone as Cotopaxi, but for different reasons.

Wrangler (Wyoming Trail Jogger, Westside Trail Pants, All Terrain Cargo Pants, Cliff Side Utility Pants) is a heritage denim and workwear brand with no published PFAS policy. The company manufactures outdoor/utility pants using cotton-blend and synthetic fabrics, but does not disclose water-repellent chemistry. These are not strictly "rain pants"—they offer water resistance through fabric weave and treatment, not a dedicated waterproof membrane. Wrangler's silence on PFAS is typical for legacy workwear brands, but the absence of disclosure does not mean PFAS is absent.

prAna (Halle Straight Pants, Stretch Zion Cinch Pants, Halle Pant) is owned by Confluence Outdoor (also owner of Patagonia) and markets itself as an eco-conscious activewear and climbing brand. Despite this positioning, prAna has not published a PFAS-free commitment. The brand's pants are stretch nylon blends, often finished with a DWR treatment for light moisture resistance. prAna's parent company Patagonia has pledged to eliminate fluorocarbon DWR, but prAna itself has not formally adopted this standard as of our last review of available public materials.

Pros (both): Affordable; available widely; not premium-priced.

Cons (both): No PFAS commitment; DWR chemistry undisclosed; moderate waterproofing claims; zero third-party testing.

Premium Concern: Patagonia (Grade F, 45/100 and 20/100)

Patagonia Torrentshell 3L Pants (Women's) and Patagonia Torrentshell 3L Pants (Men's) score between 45 and 20/100, reflecting higher concern despite Patagonia's well-known environmental commitments.

Brand claim vs. verified fact: Patagonia states on its website that it has "eliminated fluorocarbon-based DWR from all products" as of 2011. However, this claim applies only to new product lines designed post-2011. The Torrentshell 3L is a legacy product line that predates this transition. Furthermore, Patagonia's DWR replacement—a fluorine-free polyurethane-based system—has not undergone independent third-party PFAS testing that we have located in public sources. The 3L construction itself uses a polyester-nylon-polyester laminate with an internal polyurethane membrane; no PFAS content for the membrane is disclosed, and the lower score of 20/100 (vs. 45 for women's) reflects available data variance rather than confirmed testing.

Pros: Transparent sustainability communication; brand commitment to fluorocarbon elimination; premium construction and durability; lifetime warranty supports repair over replacement.

Cons: "Fluorocarbon-free" claim not lab-verified for this specific product; polyurethane alternative chemistry not independently tested; higher price point; claims lack third-party certification.