Light enough to be discreet, equipped with a windproof membrane, it can cope with the cool morning air in the fall or spring, especially by foggy days when the sun is not there to warm the air!
From a practical standpoint, there is a lateral rear pocket, wherein a cable gland is provided. A very large mesh insert at the back and under the arms, allow the jacket to breathe well.
For lower temperatures and without going to the sleeved clothing, there is the Flash vest, same cup, but thicker (slightly less breathable).