The jacket is the optimum compromise between windproof, heat capacity and breathability. At temperatures between 0 ° and 8 ° I have been neither frozen nor I came up a sweat - under the jacket I always carried two thin functional shirts. The underarm vents (zippered) are useful when it is still too hot. Based on experience, I assume that the jacket, possibly supplemented with an insulating fleece layer, even at substantial zero temperatures can be driven.
With regard to the resistance to rain I was pleasantly surprised - at a 1.5 hr journey lasting in medium heavy continuous rain I am in any case remained dry under the jacket..
Conclusion: The perfect winter garment for active cyclists