Pertex is the brand name of a range of high-performance fabrics engineered for use in apparel, sleeping bags and down jackets.

What makes Pertex fabric so special? Capillary action technology.

This is a complicated term to explain why Pertex fabrics keep you comfortable when the going gets tough. Moisture moves through the capillaries, between the fibers and spreads over a large surface where it evaporates quickly.

The magic word today is comfort. Comfort related to the outdoors and sports apparel markets means dry. Dry means dry on the inside and not getting wet from the outside.

Pertex fabric technology is based on a natural phenomenon called capillary action technology. This is a complex term. Let us explain it is an exciting science. Capillary action is the ability for water to be drawn up into narrow spaces. Pertex use the optimum fibre size for this to happen, and so create the thousands of capillaries within the fabric. Moisture moves along the capillaries between the fibres and spreads over a large surface area where it evaporates.

Capillary action technology in Denier Gradient fabrics.

Pertex Equilibrium is a revolution in fabric technology. It is a first patented Smart Fabric', combining properties until now contradictory. Pertex Equilibrium has a unique denier gradient' structure. It combines two different yarns with different properties.

On the inside you'll find a yarn with larger filaments, on the outside a yarn with smaller filaments. You can actually see the two different yarns by comparing inside and outside of the fabric. Now we have to introduce a 3rd law of capillary action: moisture will move from large filaments to smaller filaments. In case of Pertex Equilibrium it will wick the moisture 3-dimensionally away from the body.

Controlled airflow technology

Pertex fabrics have a high level of wind resistance but allow a precisely controlled amount of airflow through the fabric. This controlled airflow plays an important role in evaporating excessive moisture build-up from the inside of your jacket.


All Pertex fabrics achieve a high, controlled level of wind resistance. This keeps you warm when you want to be, and increases the thermal efficiency of sleeping bags dramatically.

A highly wind resistant fabric has several key advantages:

  1. A windproof jacket prevents hypothermia. It increases your comfort zone
  2. A more unknown factor is that a wind resistant fabric increases the thermal efficiency of sleeping bags dramatically.
This is how it works. A Goose down jacket has insulation and this is filled with warm air. Through a windproof fabric the warm air can't escape and this increases the thermal efficiency of the jacket by several degrees! That's the difference between freezing or feeling warm and comfortable in your jacket.

How does this work?

Imagine a bundle of very fine fibres, and a same size bundle of thicker fibres. The bundle of finer fibres has a greater surface over which moisture can spread, finer fibres will evaporate moisture more quickly. The capillary action process of course needs fuel to sustain itself, which in this case is the moisture from the inside. The fuel lines are the thicker fibres, they bring the moisture to the thinner fibres on the outside.

The engine behind this process is again your own body heat. Through evaporative heat loss Equilibrium reduces overheating, which in return reduces excessive sweating. This process creates body temperature Equilibrium'.

Fabric softness

Our fabrics are the softest on the market. A soft fabric has several unexpected advantages:

1. Feels better on the skin.
2. Restricts you less in your movement.
3. Less noisy. Have you noticed some sleeping bag fabrics sound like a paper bag? How would it be to sleep inside a paper bag?
4. Packs much smaller inside your pack.
5. Allows the precious down or synthetic filling of your sleeping bag to achieve its full loft. More loft means warmer.

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