This can be condensed into one simple chain of reasoning - water conducts heat away from the body around fifty times faster than air.
This may seem like a strange question - er, to keep you dry, right? But when we’re talking about ‘modern’ waterproofing, we’re talking waterproofing and breathability, and we’re talking about the science of why staying dry is vital. Why is waterproofing important in outdoor clothing? Otherwise you might get a jacket with a label saying 17,382mm waterproofing, and then you’d be even more confused. Of course, this test is repeated multiple times on the same fabric piece and different fabrics, and they average the scores, and then usually choose a round rating below those averaged scores. Once water begins to seep through the fabric, the test is over, and whatever milestone it reached, that’s it’s rating. More and more water is poured in, and as it begins to rise up past these measurements, if the fabric continues to hold the water back, then it achieves that ‘rating’. This tube is of an indeterminate length, but has measurements on the side. Now, water is poured into the tube, and as more water is added, the weight increases, and so does the water pressure pressing down on the fabric. Eh? What does that mean? Well, let’s look at how the test is administered.Ī piece of the fabric being tested is spread flat, and a one-inch diameter tube is placed on top of it (standing upright). how long will this fabric endure rain? But rather by using water pressure in the form of weight. Waterproofing isn’t measured over time - ie. In laymans, that’s waterproofing, but the science behind it is interesting. The rating you see on fabrics and gear (25,000mm, for example) is actually what’s known as the hydrostatic head of that fabric.
We’ll explain what that is below, but before we get onto that, let’s get down to brass tacks, and explain what the numbers mean in real-world terms, because they’re likely what you’ve come across on your shopping travels. Waterproofing is measured in ‘mm’ because of the hydrostatic head test. But why is it measured in ‘mm’? This is a rabbit hole situation, so let’s backpedal and take it from the top. Anything about 3,000mm is rated as ‘waterproof’. Wait… what? Surely a fabric is either waterproof or it isn’t? Uh, you’d think so, but no.
Waterproofing is the sliding scale of how much water a fabric can endure before it lets any moisture through. Enjoy the adventure and stay warm out there! What is waterproofing and how is it measured? Plus, we have sprinkled in some fascinating facts to enrich your understanding. Equipped with this knowledge, you'll be ready to hit the slopes in every condition. This guide serves as your resource to smartly navigate the myriad options in outdoor clothing, specifically when choosing items like ski jackets for men and ski bibs. Frequently asked questions about waterproofing and breathability Mastering the science of ski gearĪs snow enthusiasts, being informed about waterproof and breathability ratings of your gear is essential.
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