| What it is | Waterproof-breathable ePTFE membrane |
| Key tech | Direct Venting (vapor through membrane) |
| Reputation | Very breathable, fast-venting |
| Care | Keep clean to preserve breathability |
eVent is a waterproof, breathable membrane built on expanded PTFE, known for its ‘Direct Venting’ technology that lets sweat vapor pass straight through the membrane rather than through an added layer. This gives it a reputation for high, immediate breathability, making it popular in high-output shells, though it traditionally requires diligent cleaning to stay breathable.
eVent vs Gore-Tex
Both are ePTFE membranes; eVent vents directly for breathability, versus the protective layer of Gore-Tex. Both rely on a DWR finish.
Frequently asked questions
What is eVent fabric?
eVent is a waterproof and breathable membrane made from expanded PTFE, used in outdoor shells and footwear. It's distinguished by 'Direct Venting,' which allows perspiration vapor to escape directly through the membrane, giving it a strong reputation for breathability among high-output users.
How is eVent different from Gore-Tex?
Both use ePTFE membranes, but classic Gore-Tex adds a polyurethane layer over the membrane to protect it from contamination, while eVent vents moisture straight through. Many users find eVent more immediately breathable, while Gore-Tex's protective layer can make it more forgiving of dirt and oils. Newer Gore-Tex versions have closed much of the gap.
Does eVent need special care?
Keeping it clean matters: because eVent's pores are more exposed than older Gore-Tex, body oils, sweat, and grime can clog them and reduce breathability over time. Washing the garment per the care instructions and reproofing the DWR keeps an eVent shell performing well.
Sources
- eVent technology — eVent Fabrics
- Shell fabrics — The Mountaineers