Gore-Tex, Down and DWR
In technical outerwear, the membrane, the insulation and the water-repellent finish cannot be judged from the outside alone. This guide explains what each one does and how it fails.
In this guide
Technical outerwear is difficult to judge from the outside, because the parts that matter are not visible on the surface. A shell can look clean and no longer be waterproof. A shell with a worn surface can still be fully functional.
Three things decide the condition: the membrane, the insulation and the water-repellent finish. Knowing what each one does and how each one fails is what the assessment rests on.
The membrane
A waterproof jacket is not made of waterproof fabric. It consists of a face fabric bonded to a thin membrane, with a lining that protects the membrane from the inside. The membrane stops water and lets vapour out, and it is the part that ages.
How it fails. There are two ways. Delamination is when the membrane separates from the face fabric, which shows as bubbling or a papery, detached feel in the lining. Hydrolysis is when the membrane itself breaks down over time, which is harder to see and tends to show as a sticky or flaking inner surface.
How to check. The jacket is turned inside out and the lining is examined in good light. Bubbling, lifting, flaking and a tacky surface are all signs of a failing membrane.
The seam tape
Every seam in a waterproof jacket is a row of needle holes. Seam tape covers them from the inside.
How to check. The jacket is turned inside out again and the seams at the shoulders, the hood and the underarms are followed. The tape should be flat, continuous and firmly bonded. Lifting at the edges, cracking, and tape that has become brittle or yellow all mean the same thing: the jacket is no longer waterproof at that seam.
A shell with failing tape no longer keeps water out at the seams, so it no longer matches what the label describes.
DWR and why a jacket wets out
DWR stands for durable water repellent. It is a finish applied to the outside of the face fabric that makes water bead and roll off. It is separate from the waterproofing, and the two are often confused.
When the DWR wears off, the face fabric absorbs water. The jacket looks soaked and feels cold, and breathability drops because the wet outer layer blocks vapour. The membrane underneath can still be working.
What can be renewed. Unlike a membrane, DWR can be renewed. A wash-in or spray-on treatment followed by gentle heat restores it. On a pre-owned shell, wetting out is a maintenance matter rather than a fault.
How to check. The state of the DWR cannot be judged reliably from a photograph. A shell without a recent treatment may need re-proofing, which is a maintenance step, unlike a failed membrane or failed seam tape.
Down against synthetic
Insulated jackets fall into two families that age differently.
| Down | Synthetic | |
|---|---|---|
| Warmth for weight | Higher | Lower |
| When wet | Loses almost all insulation | Keeps most of it |
| How it ages | Loses loft, clumps, migrates through baffles | Compresses permanently, thins evenly |
| Recoverable | Often, with careful washing and drying | Rarely |
How to check either. The jacket is held up to the light, looking for even distribution across every baffle or quilted panel. Cold spots, thin patches and clumping at the bottom of baffles all mean that loft has been lost.
A down jacket that has clumped can often be restored with a careful wash and a long, low tumble dry with dryer balls. Compressed synthetic insulation generally cannot be restored.
A few feathers escaping through the shell are common and not a fault. A steady loss through one seam is a fault.
Fleece
Fleece has no membrane to delaminate and no seam tape to lift. Its main sign of age is pilling.
Light pilling is cosmetic. Dense matting under the arms and along the sides means the pile has broken down. Those areas are checked first and the rest of the garment second.
In a technical jacket, the membrane and the insulation age out of sight. In fleece, the condition shows on the surface.
Leverene
Order of checks
- Turn the jacket inside out.
- Look at the seam tape at the shoulders and the hood to see whether it is flat and bonded or lifting.
- Feel the lining to see whether it is smooth or tacky and flaking.
- On an insulated jacket, hold it to the light to see whether the insulation is even or patchy.
- Check the zip, including the storm flap and pit zips where present.
- Allow for re-proofing of the DWR as a separate maintenance step.
Care
Correct washing matters for technical outerwear. The short version: a technical wash rather than detergent, no fabric softener at any point and gentle heat to reactivate the DWR.
The method, material by material, is in the guide to washing and caring for clothing.
Where to start
Fleece has no membrane and no seam tape, so the main check is the condition of the pile. On a shell, the inside is checked first: the lining and the seam tape.
The available items are collected under outdoor, with separate pages for men and women, and in the jackets and coats collections.
Individual brands are covered in the guides to Patagonia, The North Face and Canada Goose, and the category overview is in the guide to outdoor clothing.
Sources
- Membrane construction, delamination and hydrolysis, seam tape function, DWR as a renewable surface finish separate from waterproofing, and the behaviour of down compared with synthetic insulation are all general technical-textile knowledge. No brand-specific or dated claims are made in this article.
- Category composition reflects the leverene outdoor collection, August 2026.
