B'TWIN RC 900 Winter Road Cycling Jacket - Red

The third layer is the layer that protects you from the elements, for instance the cold and the wind, while the underneath layers offer warmth and breathability. By wearing a suitable cycling jacket, you will maintain your performance and comfort, whatever the weather.
This 500 cycling jacket keeps you nice and warm with its integrated, removable neck gaiter. The adjustable vents let perspiration escape.

A product's ability to protect from the cold. It depends on the material's thermal resistance and how much air can pass through it. The higher its thermal resistance, the more the product retains the heat produced by the body while cycling.

To determine whether a fabric is breathable, we measure its evaporative resistance (test based on standard ISO 11092).
The lower its resistance, the more the fabric will let water vapour produced by the body escape, and therefore the more breathable it is.
For example: RET < 9 = extremely breathable fabric