ALL ABOUT WATERPROOF FABRICS
Waterproof Ratings
Every waterproof jacket you buy, will most likely come with some sort of waterproof rating, which simply put is a guide to how well and long the jacket will keep out the water. Fabrics are tested using a Hydrostatic Head ( HH ) tester – a machine that determines the resistance of fabrics to water penetration under pressure. The fabric is placed around the bottom of a cylinder, then water is added until it leaks through the fabric. The machine measures the “head” (pressure) of water that can be applied to a fabric before water penetration is observed. The minimum standard to call a fabric “waterproof” is 1000 mm HH, and over a period of 24hrs. There are many figures and claims made by companies and the outdoor academia as to what HH is required to keep all water out in normal conditions, however there is no definitive answer. 10,000 mm HH will certainly be sufficient!. Waterproof rating should be used only as a guide between similar styled and brand garments. Many other factors such as the design, features and construction of the garment factor heavily in the overall ability to keep you dry.
Breathability
This term is probably the most often discussed feature or quality of today’s modern waterproof jacket.
When humans are active, we perspire or sweat and create a moist atmosphere inside the garment we are wearing, and as exertion/activity increases, moisture from sweat builds up inside the garment. This moisture is a problem as not only does it make us more uncomfortable, it also increases the potential to overheat whilst active, and at rest can cause us to get cold. Being wet in very cold conditions can lead to hypothermia.
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