Wind decreases the perceived temperature considerably.
With an outside temperature of 0°C and a 20 km/h wind, the perceived temperature will be -10°C.
The so-called "windproof" components eliminate the discomfort associated with the "wind chill" effect. They are very effective at reducing heat loss by creating a barrier against the wind.

In areas that are sensitive to wind (front and sleeves) the fabric has a windproof membrane; breathability is therefore lower.
Performance is 2839 g/sqm/24h (according to standard JIS 1099 A).
On the back and sides, the fabric does not have a membrane, to improve breathability.
Performance is 3219 g/sqm/24h (according to standard JIS 1099 A).

The water repellent property of a fabric is its capacity to make water run off its surface without absorbing it.
This prevents the fabric from soaking up water, and keeps it lightweight and breathable. The fabric is made water repellent by treating its outer surface, however this property may deteriorate with use.
In order to reactivate it, follow the guide:
https://www.quechua.fr/conseils/comment-reactiver-la-deperlance-de-sa-veste-a_86425

Waterproofing spray for leather and textiles. https://www.decathlon.fr/bombe-re-impermeabilisant-id_5954981.html
Regenerates the water repellency of the fabric and optimises the performance of your garment throughout its lifespan.

The product's environmental impact is calculated over its entire life cycle using different indicators.
An overall score from A to E is given to help you easily identify the most environmentally-friendly products by comparing products of the same type (T-shirts, trousers, backpacks, etc).
Decathlon is committed to displaying the environmental data of its products.
For more information: http://sustainability.decathlon.com/