Waterproof Explained
Explanation to the different levels to something been classed as waterproof.
Waterproofing is the sliding scale of how much
water a fabric can endure before it lets any moisture through. Wait… what?
Surely a fabric is either waterproof or it isn’t? Uh, you’d think so, but no.
Anything about 3,000mm and above is rated as ‘waterproof’.
Waterproof ratings: what do the numbers mean?
Below 5,000mm
While ‘waterproofing’
begins at 3,000mm, anything up to 5,000mm is only going to stand up to a light
shower, maybe some drizzle. Some outdoor jackets with this rating might be
things like super lightweight and packable jackets. Snow jackets that have this
rating are likely meant for the park or fair-weather riding, not for snowstorms
or ploughing through powder!
5,000 - 10,000mm
Between 5,000mm and
10,000mm things are getting a little more stable. A lot of generic brand items
will be in this range. They’re okay for resort skiing or boarding in good
weather, but won’t stand up to much punishment and won’t be much use in the
rain.
10,000 - 15,000mm
10,000mm or 10k is often
the industry standard for branded snow goods. Very rarely will you see a
branded piece of snow gear with less than 10,000mm of waterproofing if it’s
designed for general use. This range has good resistance to the elements
without breaking the bank, and is usually where the entry-level or standard
gear from most brands slots in.
15,000 - 20,000mm
15,000mm is quickly
becoming the benchmark for many brands, and thanks to better technology, it’s
more attainable than ever at an affordable price. 15,000mm is reliable and
solid for use all over the mountain, in all weathers. 15,000mm is more
waterproofing than most riders will ever need.
20,000 - 25,000mm
As we get above
20,000mm, you’re looking at serious performance. Most brands’ ‘performance’ or
technical ranges tend to be in this category. Mass produced (i.e. generic,
rather than patented brand specific) technical membranes usually top out at
this kind of figure, but it’s more than enough for riding in even the worst
weathers!
25,000mm and above
25,000mm is when you
start to get into that more ‘black and white’ level of waterproofing, i.e. if
it’s above 25k, then it’s never going to let water in. Gore-Tex offers a
dryness guarantee, and it’s rated at 28,000mm, for reference! Anything sporting
a 25,000mm water column or more is a serious piece of gear ready for the
toughest adventures. Blizzards, hurricanes, you name it, let’s go!
Gore-Tex
Gore-Tex is the brand
that single handily took waterproofing from non-breathable plastic sheets to
breathable membranes. Heated and rapidly stretched PTFE creates a microporous
synthetic fabric that keeps water out, but lets vaporised sweat through, for
industry leading performance, decades on from its original conception. Their
range now contains many different iterations, but all possess the same great
performance.