Because combining waterproofness and breathability is a real headache, we'll help you better understand these terms so you can choose the ideal coat, suited to your daily activities.

1 - What is waterproofing?
Waterproofing is the ability of a fabric to prevent water penetration. Therefore, the primary characteristic of a waterproof coat is to protect you from the rain. But it's not as simple as it seems. There are different degrees of waterproofing, which can be measured to assess a fabric's performance. They are often represented by a number of millimeters (10,000 mm or 10K), called a waterproof rating.

For example, with a waterproof rating of 10,000 mm, the fabric is capable of withstanding a 10-meter column of water before water begins to seep through. Therefore, the higher the rating, the more waterproof the fabric. A coat is considered perfectly waterproof from 20,000 mm.

But then, is it the same thing to have a waterproof coat and a water-repellent coat? No. A water-resistant, or water-repellent, fabric only protects against light rain, because the water will roll off the fabric instead of soaking in. But if the downpour is too heavy or the exposure to the rain is too long, the water will eventually penetrate.

2 - What is breathability?
It is the ability of a fabric to wick away water vapor. To prevent perspiration from condensing inside the garment, a fabric with good breathability is essential. The moisture vapor transmission rate (MVTR) determines the amount of water (in the form of vapor) that the fabric can allow to pass through in 24 hours.

30K = extremely breathable garment
20K = garment with very good breathability
10K = breathable garment
5K = poorly breathable garment

3 - The waterproofness/breathability balance?
By definition, it is difficult to combine waterproofness and breathability, but companies have developed technical features capable of combining these two qualities essential to our comfort.

Technical membranes: they contain millions of microscopic pores, large enough to let water vapor (perspiration) pass through, but small enough to retain rain.

Zippered vents: usually located under the arms, they provide better air circulation and allow moisture to escape more quickly.

In conclusion, choosing the right coat means finding the right balance between waterproofing and breathability for your activity. Whether you're braving a heavy downpour or staying dry while wicking away moisture during intense exercise, understanding these two concepts is essential.

For personalized advice, do not hesitate to come and ask our team in store.

Sources:
www.terrederunners.com
www.chlorophylle.com