DWR in 2025: Rain Jacket Water Repellency, PFAS-Free Options & Care Tips
If you’ve watched rain bead up and skate off your shell, you’ve seen DWR doing its job. Durable Water Repellent is a finish applied to the face fabric of waterproof/breathable jackets. It doesn’t make the jacket waterproof; that’s the membrane or coating underneath, but it keeps the outer fabric from soaking up water. When the face fabric “wets out,” the surface gets saturated, breathability nosedives, the jacket feels clammy, and you might think the membrane has failed even though it’s fine. Keeping that outer layer beading is the whole point of DWR.
Fluorinated DWR
A lot has changed in how brands achieve that beading. For many years, the gold standard was a class of long?chain fluorinated finishes often lumped under “C8.” These created a surface that resisted both water and oily contaminants, and they held up well over time. The downside was the environmental and health concerns tied to persistent chemicals like PFOA and PFOS associated with that era. These long-chain PFAS are forever chemicals that are especially prone to bioaccumulation and long half-lives in humans and have been linked to health effects kidney and testicular cancer, cholesterol increases, reproductive impacts, and thyroid and endocrine disruption, among others.
Starting in the 2010s, companies began to move away from those long chains. The first stop was short?chain fluorinated chemistry, commonly called C6. It’s still fluorinated, still great at making water bead, but typically a bit weaker at resisting oils and not as long?lasting as the old C8.
PFC-free and PFAS-free DWR
More recently, there’s been a strong push toward non-fluorinated DWR finishes, often marketed as PFC-free or PFAS-free. These alternatives include silicone, hydrocarbon/paraffin, polyurethane, and newer polymers. When new and clean, many of these bead water very well. Where they tend to lag is in durability under abrasion and in resisting contamination from oils and dirt. They also require more frequent maintenance to maintain optimal performance. Despite that, adoption is growing fast, especially among European brands and lines that prioritize stricter chemical standards.
It’s worth clearing up a common misconception about how DWR works. You’ll sometimes hear that beading happens because there’s a single fluorine atom at one end of a polymer chain that repels water. The real story is broader: DWR finishes work by creating a surface with very low surface energy, which makes it hard for water to spread. Fluorinated materials are exceptionally good at lowering surface energy, which is why they dominated for decades. PFAS?free chemistries aim to accomplish a similar effect without fluorine, and they’ve improved a lot, but they still generally trail fluorinated finishes in oil repellency and long?term durability.
Why Does DWR Fail?
Why does DWR stop working in the field? Three main culprits show up again and again:
- contamination
- abrasion
- aging
Dirt, sunscreen, skin oils, and residues from regular detergents raise the surface energy of the fabric and make it easier for water to wet out. Pack straps, brush, and repeated flexing physically wear down the finish. UV light and time degrade it further. The symptoms are familiar: dark, damp?looking fabric, a cold, clammy feel against your midlayer, and a sense that you’re “leaking.” Often, the membrane is fine: the face fabric is just saturated and blocking moisture vapor from escaping.
DWR Care Tips
The good news is that DWR is surprisingly recoverable with basic care. Start with a proper wash following the care label. Use a technical cleaner like Nikwax Techwash or Granger’s Performance Wash rather than a household detergent, and never add fabric softener. A clean surface restores beading more than most people expect. After washing, add gentle heat if your label allows it: a short tumble on low or a warm iron with a towel barrier helps reorient the finish to the surface.
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Timely article! Do you think there is any significant difference in efficacy between the various current DWR finishes used by the major vendors?
No, not really. Most are made at the same factory in Vietnam probably. It’s also s subject to user behavior (what they do to a jacket – think folding, using it with backpacks, etc), you’d be hard pressed to find a relaible comparison.
Never use Nikwax Tech Wash (or any Nikwax product) on silpoly fabrics that have a PU (polyurethane) inner coating. It can break down the PU layer and cause premature delamination, even after a single wash. Learned this the hard way and ruined my silpoly rain jacket.
I find this hard to believe because Nikwax Techwash is so gentle. I’m not trying to defend Nikwax here. But you left the same comment on another article of mine, so you have a be in the bonnet about this.
Which jacket was this?
Why do you find it hard to believe?
LightHeart Gear’s product page for the SilPoly Rain Jacket explicitly says: “DO NOT USE NIKWAX PRODUCTS ON THIS JACKET.” Unfortunately, I failed to notice that before washing mine with Tech Wash, and the PU coating began to delaminate after just one wash.
So this is less a “bee in the bonnet” and more of a cautionary note so others don’t repeat my mistake. No ill feelings against LightHeart Gear or Nikwax, I just want to pass along what I learned the hard way.
thank you for bringing this to my attention.
Here’s what Nikwax says about it:
There is nothing in Tech Wash that causes this damage. It is normally from an older or well-worn jacket that has not been washed before. Bacteria and dirt cause the PU lining to begin to break down, and then the agitation of washing finishes the job. Unfortunately, this type of damage is a common issue with PU coatings, but is not created by Tech Wash.
A quick question – when you say the jacket delaminated…did the seam tape just release or did the material itself break down?
This discussion continued offline. Watch this space for futher development!
Just get a rainjacket that doesn’t require DWR maintenance. My rain jacket from Lightheart Gear is fantastic, naturally repels water without any DWR treatment.