Breathability IME works in reverse proportionality to waterproof. Gabba etc are OK but definitely feels humid in there if I’m trying hard
Yep, pretty much. The Gabba uses a Gore Windstopper fabric, which is basically a waterproof fabric, though not taped, which is why it’s not technically waterproof. There’s slightly more to it than that, but not much.
I’d agree that you need to understand whereabouts on that continuum between fully windproof and very water resistant, but not too breathable at one end of the scale and less weather resistant, but considerably more breathable at the other.
For me, Rab’s Vapour Rise stuff works really well, but that’s because I tend to run hot and mostly ride relatively hard. If you’re someone who runs cool and rides steady, then something less breathable, but more weather resistant makes sense.
On top of that, you need to consider temperature, wind speeds and humidity… I think it probably makes more sense to stay in bed.