Key takeaways
- Gore-Tex is a brand of waterproof-breathable membrane, not a fabric type by itself.
- Its pores block liquid rain droplets but pass water vapor, so rain stays out while sweat escapes.
- The membrane is laminated between a face fabric and lining and paired with a DWR finish.
- Comes in lines (e.g., Pro, Paclite, ePE) tuned for durability, weight, or packability.
From inventor W. L. Gore & Associates; based on expanded PTFE.
How Gore-Tex works
Gore-Tex is a waterproof, breathable membrane built around billions of microscopic pores. The pores are far too small for liquid rain droplets to pass — so water stays out — but much larger than a single water-vapor molecule, so the sweat you produce can escape. That combination is what ‘waterproof-breathable’ means: rain blocked, perspiration vented.
Membrane, not fabric
The membrane itself is fragile, so it’s laminated between an outer face fabric and an inner lining to make the finished material. The face fabric carries a DWR finish so water beads off and doesn’t saturate the fabric — which is essential to keep the membrane breathing.
After a few seasons a hiker notices their Gore-Tex shell feels clammy in rain. The membrane is fine — the face fabric has wetted out — so they wash it and reapply DWR, and water beads and breathability return.
Product lines
Gore offers several constructions — durable Pro for hard alpine use, ultralight Paclite for packability, and newer PFC-free ePE membranes — each balancing durability, weight, and breathability. A Gore-Tex membrane is the heart of most hardshells and many a rain jacket. Compare it with a competitor in Gore-Tex vs eVent.
The bottom line
Gore-Tex is the benchmark waterproof-breathable membrane: it blocks rain while letting sweat vapor escape, and it's laminated into jackets and footwear with a DWR-treated face fabric. Different product lines trade durability, weight, and packability — and keeping the DWR fresh is what preserves the breathability that makes it worth the price.
Frequently asked questions
How does Gore-Tex work?
Gore-Tex uses a thin membrane with billions of microscopic pores. Each pore is far too small for a liquid water droplet to squeeze through (so rain can't get in) but much larger than a water vapor molecule (so sweat can get out). Laminated into a jacket and topped with a DWR finish, it keeps you dry from rain while venting some perspiration.
Is Gore-Tex fabric or a membrane?
Gore-Tex is the membrane, not the whole fabric. It's bonded (laminated) between an outer face fabric and an inner lining to make the finished waterproof-breathable material. So a 'Gore-Tex jacket' is really a jacket whose fabric contains a Gore-Tex membrane.
Why does my Gore-Tex jacket wet out or feel clammy?
Usually the outer face fabric has 'wetted out' — its DWR finish has worn off, so the fabric soaks up water and blocks breathability, making you feel damp inside even though the membrane still keeps rain out. Cleaning the jacket and reapplying DWR restores both water repellency and breathability.
Sources
- How Gore-Tex works — Gore-Tex
- Waterproof-breathable fabrics — The Mountaineers