GORE-TEX in trainers: what it does, and where it stops
A membrane sits between the lining and the outer fabric of the shoe. Water cannot get through it; water vapour can, slowly. That is the whole idea, and most of what is worth knowing is about the word slowly – and about the parts of the shoe the membrane does not cover.
What it actually is
GORE-TEX is a thin film of expanded PTFE – the same family of plastic as non-stick pan coating, stretched until it is full of holes. The holes are far too small for a drop of liquid water to pass, and large enough for a single molecule of vapour. The film is fragile on its own, so it is laminated between fabrics and, in a shoe, usually made up into a bootie that the upper is built around.
What it promises, and where the promise ends
Every claim you will read is about the membrane. A shoe is not a membrane. It has a collar you step through, a tongue stitched at the sides, and seams. Step into water deeper than the collar and the shoe fills from the top, and then the same membrane that kept water out keeps it in. A waterproof shoe that floods stays flooded, long after a mesh one has drained and dried.
The breathability works the same way round. Vapour moves through the film because the air inside the shoe is warmer and wetter than the air outside; the bigger that difference, the faster it moves. On a cold, dry day walking, that difference is large and the membrane keeps up easily. Running in mild weather, feet produce sweat faster than any membrane shifts it, and the inside of the shoe gets damp regardless of what the box says. Neither of those is a defect. It is what the mechanism can and cannot do.
There is also a cost that never appears in the marketing: a membrane and its lining add weight and stiffness against a plain mesh upper, and they slow drying by a lot. In a British winter that is usually a fair trade. In July it is not.
The versions
The name on the box is not one thing. Three variants turn up in footwear and they behave differently:
- GORE-TEX – the standard build, membrane laminated into a bootie inside the upper.
- Invisible Fit – the membrane bonded straight to the upper rather than made up as a separate bootie. Less bulk and a closer fit, which matters in a running shoe more than in a boot.
- Surround – built so that vapour can also leave through the sole rather than only through the upper. Mostly found in walking and everyday shoes.
The film itself is older than any shoe it is in. It came out of a laboratory in 1969, when stretching heated PTFE quickly rather than slowly turned a solid rod into a porous membrane, and it reached outdoor clothing through the 1970s. Footwear came later, and the versions above are all attempts at the same problem: how to get the film into a shoe without the bulk of a jacket.
Since 2023 Gore has also been moving its footwear laminates from PTFE to a new membrane based on expanded polyethylene, made without the PFAS chemistry that put the older material under regulatory pressure. Where you see it, it does the same job.
One version is not waterproof
GORE-TEX INFINIUM is the brand Gore uses for products built for wind and light weather, not for rain. It carries the same logo and sits on the same shelf, and it will wet through in a downpour, because it is not meant to do otherwise.
If the shoe is being bought for rain, the word INFINIUM next to the logo is the one to check for.
When it earns its place
It earns it when the water is on the ground and below the collar: wet grass, mud, slush, puddles you walk through rather than into, snow. Cold weather helps twice over – the ground is wet, and the temperature difference that drives the breathability is at its largest. Winter trail running and long walks in the wet are what this membrane is for.
It earns it much less when the water comes from above. In steady rain, water runs down your legs and in over the collar, and once it is in, the membrane works against you. It earns it least in warm weather, at speed, or on anyone whose feet run hot: there the extra layer costs you comfort every time you go out and pays you back only occasionally.
The honest summary is that a membrane narrows what a shoe is good for. It buys you dry feet on wet ground and charges you breathability, drying time and a little weight on every other run.
Keeping it working
Shoes with a membrane usually stop performing long before the membrane fails, and the reason catches people out. The outer fabric carries a water-repellent finish. When that finish wears off, the fabric soaks up water and holds a film of it against the film underneath. The membrane is still perfectly intact, but vapour cannot cross a layer of standing water, so the shoe stops breathing and feels wet inside. That is the finish going, not the membrane.
Washing off the mud and dirt that hold water in the fabric is most of the fix. Where a shoe has gone through several winters, the repellent finish can be renewed with a proofing wash or spray made for the job. Both are worth doing before deciding a pair has died.
Where you’ll find it
Shoes on this site built around a GORE-TEX membrane. They are examples of what the technology does in practice, not a catalogue.
See it in the full table, where you can filter by activity, material and price.
Similar and competing technologies
GORE-TEX is the name most people know, but it is one membrane among several, and the alternatives are not variations on the same thing – they solve the problem in different places. All of them are working against the same trade: the more watertight a film is, the harder it is for vapour to cross it.
| Approach | How it works | What it trades |
|---|---|---|
| Porous film · GORE-TEX, eVent | A film full of holes too small for a drop and large enough for vapour. | Depends on the face fabric staying dry. Once that wets out, breathability goes with it. |
| Solid film · Sympatex, polyurethane | No holes at all. Moisture is carried through the material itself, molecule by molecule. | Harder to puncture and easier to recycle, but it leans more heavily on a temperature difference to move vapour. |
| Film on the outside · OutDry | The membrane is bonded to the outer surface rather than hidden behind it. | Nothing in front of it to soak up water, so it cannot wet out – at the cost of how the shoe looks and feels. |
| A brand’s own · RAIN.RDY, ClimaSalomon | Most large makers fit a membrane of their own alongside the licensed ones. | Usually cheaper in the shoe. Less is published about them, so there is less to check. |
Worth knowing before you read a spec sheet as a contest: a brand fitting GORE-TEX is not competing with it. The GTX in a Salomon or an ASICS name means that shoe is built around the licensed membrane, and the brand’s own version sits on a different model in the same range.
The parts of the shoe around it matter as much as the membrane itself. What the upper is made of decides how fast the shoe drains and dries once water does get in, and the outsole decides whether you stay upright on the wet ground you bought the membrane for.