| What it is | Water-repellent finish on the face fabric |
| Job | Makes water bead and roll off |
| Not | The waterproof layer (that's the membrane) |
| Maintenance | Wears off — reproof periodically |
DWR (Durable Water Repellent) is a chemical finish applied to the outer face fabric of waterproof-breathable garments that makes water bead up and roll off rather than soaking in. It isn’t what makes a jacket waterproof — the membrane does that — but it keeps the face fabric from ‘wetting out,’ which would block breathability. DWR wears off and needs periodic reproofing.
Keeping it working
When DWR fails the fabric wets out and breathability drops — restore it by reproofing. Modern finishes are increasingly PFAS-free. It protects membranes like Gore-Tex.
Frequently asked questions
What is DWR?
DWR stands for Durable Water Repellent, a treatment applied to the outermost fabric of rain jackets and other gear. It causes water to bead up and run off instead of soaking into the fabric. DWR is a surface finish, separate from the waterproof membrane underneath.
Why does DWR matter for breathability?
When the face fabric soaks through ('wets out'), a layer of water blocks vapor from escaping the membrane, so the jacket feels clammy even though it isn't leaking. A working DWR keeps the outer fabric dry, preserving the membrane's ability to breathe. That's why a tired DWR makes a jacket feel like it's failing.
How do you restore DWR?
First wash the garment to remove dirt and oils, then reactivate the existing DWR with gentle heat (a tumble dry or warm iron, per the care label). When water no longer beads after cleaning, apply a new DWR treatment via a wash-in or spray-on product — increasingly PFAS-free formulas — to reproof it.
Sources
- DWR and wetting out — The Mountaineers
- Garment care — W. L. Gore & Associates