The Hidden Danger in Your Outdoor Gear: Forever Chemicals
Ahad
/ February 23, 2025
Recently, there’s been a lot of talk about PFAS “forever chemicals” found in water-repellent outdoor clothing. These chemicals are toxic and linked to cancer. After diving deep into this topic, I realized the situation is far more serious than I initially thought.
How Much of Your Hiking Gear is Toxic?
When you think of toxic hiking gear, you probably imagine rain pants and jackets, right? The truth is, about 90% of the gear in that picture-perfect hiking setup likely contains forever chemicals. Even items you wouldn’t expect, like wool socks, t-shirts, and backpacks, might have them.

What Are Forever Chemicals?
Forever chemicals, also called PFAS (per- and polyfluoroalkyl substances), are a group of industrial chemicals made up of a carbon chain surrounded by fluorine. When applied to materials, they magically increase durability, water resistance, oil resistance, and fire resistance. Invented in 1934, they became widely used in the 1950s, with Teflon being a popular example for non-stick cookware.
Over the years, companies like 3M started using Forever chemicals in various products, including cosmetics, carpets, ski wax, pizza boxes, paper coffee cups, and more. In hiking gear, Gore-Tex is a prime example. Forever chemicals is what made Gore-Tex famous, allowing their fabrics to be both water-resistant and breathable.
The Dark Side of PFAS
In 1998, a farmer sued DuPont, blaming their Teflon chemical plant for his cattle’s deaths. This was just the beginning. By 2017, DuPont had settled over 3,500 lawsuits linked to PFOA, a harmful chemical in Per- and polyfluoroalkyl substances.
Per- and polyfluoroalkyl substances , often called “forever chemicals,” don’t break down naturally. They persist in the environment for hundreds or even thousands of years. Studies show they’re toxic, linked to cancer, and harmful even in tiny amounts. They build up in our bodies over time, and nearly everyone has them now because they’re in water, soil, and air. Avoiding PFAS is nearly impossible, making them a serious health risk.

The Game of Whack-a-Mole
Starting in the early 2000s, after lawsuits exposed the dangers of Forever chemicals, manufacturers began playing a game of whack-a-mole. When one type of PFAS was banned, they simply switched to another. Forever chemicals is a large group of over 10,000 chemicals, and only a handful are currently banned. While there’s talk of banning them as a group, especially in the EU, it hasn’t happened yet.
PFAS in Outdoor Gear
In 2016, Greenpeace tested over 40 outdoor products, including jackets, trousers, shoes, backpacks, tents, sleeping bags, and gloves from popular brands. They found forever chemicals in all product categories except gloves. Out of the 40 products tested, only four were PFAS-free.
PFAS are commonly used in:
- Waterproof membranes of rain jackets, pants, tents, backpacks, dry sacks, and footwear
- DWR treatments
- Treated down
- Non-stick coatings for cookware
However, many manufacturers unintentionally use PFAS in other products, like base layers, merino socks, cotton or synthetic t-shirts, and more. This happens because they often source materials from third-party suppliers, and there are no laws requiring disclosure of PFAS use.
Why Do Manufacturers Use PFAS?
Manufacturers use PFAS for three main reasons:
- They’re cheaper.
- They’re easier to use during manufacturing.
- They currently offer better technical performance compared to safe alternatives.
The third reason is the biggest hurdle. Safe alternatives can resist water just as well as PFAS while remaining breathable, but they can’t resist stains and oils simultaneously. Over time, these alternatives soak up oils from sweat, sunscreen, and other sources, reducing their effectiveness until washed. In my opinion, this is a small downside compared to the risk of cancer.
The Good News
Luckily, there’s some good news. A few brands have switched to PFAS-free manufacturing as early as 2009, including:
Nikwax
Páramo
Keen Footwear
Mystery Ranch
Jack Wolfskin
Houdini
Vaude
Polartec
Fjällräven
Patagonia
Deuter
Some brands, like Nemo, Arc’teryx, Black Diamond, Marmot, and Mammut, market a few of their existing products as PFAS-free. However, many other brands are dragging their feet, unwilling to switch to safer alternatives.

Change is Coming
Things are about to change. California, New York, Massachusetts, and Maine have introduced laws banning PFAS as a chemical group in most outdoor gear starting as early as 2025. This means brands wanting to sell in these states must go PFAS-free by next year. Companies like Outdoor Research, Outdoor Vitals, and REI have already promised to make the switch.
Will Your Gear Give You Cancer?
Probably not directly. You’re not eating or drinking from your Gore-Tex jacket. However, when you wash PFAS-treated gear or it degrades over time, these chemicals are released into the environment, seeping into groundwater, rivers, lakes, and even your tap water.
The people most affected are those working in factories producing PFAS-laden products or living near these factories, landfills, or airports. Small children are also at risk, as studies show they can have 10 times the concentration of PFAS in their bodies compared to their mothers.
What Can You Do?
If you want to stop supporting the PFAS industry:
Reach out to lawmakers and demand a ban on fluorocarbons in manufacturing.
Stop buying and using products containing PFAS. However, this is easier said than done, as PFAS are found in almost everything.