Probably not the best suggestion now we are into winter, but my go to windproof is a Fox gilet for three of the seasons. I find keeping my chest and back warm makes a big difference and I'm not so bothered about my arms. Avoids the sweatiness of a full jacket.
The back on mine isn't breathable though, so that does get a bit damp. My try a slightly different one in spring

I never ride in pertex any more. Modern softshell jackets seem to have made it redundant, for me.
I'll just dress for the whole ride, with a non-packable, breathable softshell jacket most of the time (in the colder months). Only exception is going up actual mountains, where I might want to put a jacket on at the top and for the descent.
I’m after a new softshell type wind jacket - what’s out there? I’ve got a Rapha trail lightweight wind one and it’s great when is chilly but dry - but when the temp dips to zero like last week it’s not warm enough - then I’d just want a windproof soft shell to wear with just a merino jersey underneath
Highly rated (by other mags) Gore Lupra mtb jacket on sale for £100 down from £180-something atm, direct or on Amazon https://www.amazon.co.uk/dp/B0013O942C?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1&psc=1
It uses Gore Infinium Windstopper fabric which is apparently very breathable (also the back is a different fabric to let heat out too)
I've just got one, but as a Christmas present so haven't tried it yet
I’m after a new softshell type wind jacket – what’s out there? I’ve got a Rapha trail lightweight wind one and it’s great when is chilly but dry – but when the temp dips to zero like last week it’s not warm enough – then I’d just want a windproof soft shell to wear with just a merino jersey underneath
I've got an Endura Singletrack which is good - very similar to the Stealth from years ago. Too warm for much above 5 degrees though, but perfect for what you're after by the sounds of it

ME Squall over the Borealis, not even close. I'd barely got the latter on before it was going back in the packaging.
Squall has the cross zip for use with a harness. The Echo is the vertical zip equivalent.
