Not sure I understand the question - it's a rain jacket so it's designed to be impermeable; here, the 'fabric' is some sort of plastic material and no air or water can pass through, in or out. Sure you can get Gore-tex or similar fabric that keeps water out but lets a little bit of air through, but not for 55 quid.
That said, it's got a zip all the way down the front and armpit vents, and that's as much breathability as you get in any rain jacket that costs less than the bike. Chances are, unless it's raining really hard or the outside temperature is below 5 degrees, you'll be riding with at least the armpit vents open.
I recommend the jacket.