Air permeability (Method Air Permeability abbreviated as: MAP): means the performance of air permeability through fabric; under specified pressure difference conditions, measure the air flow rate vertically passing through a given area of the sample within a certain period of time, and calculate the air permeability. The air flow rate can be measured directly or converted by measuring the pressure on both sides of the flow aperture. This is called true breathability!
Test standards: American standard ASTMD737, European standard ISO9237, Japanese standard JISL1096;
The ventilation unit can be expressed in mm/s or cm3/cm2/s;
According to TheNorthFace, Rei, Columbia, LLBean, EddieBauer, Adidas, Ozark and other well-known outdoor brands operated in recent years, none of them have tested breathability, and domestic outdoor clothing brands have basically not tested breathability;
Breathable means that air is transmitted to the human body through the fabric, so it may not be able to keep warm; wearing a jacket that is waterproof and warm but feels stuffy is related to non-breathability.
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