I have an Endura waterproof. It is waterproof. However, although sold as breathable it isn’t. Gets very damp very quickly inside.
Breathable doesn’t mean you won’t get sweaty… It helps the sweat escape but if you’re hot enough, you’ll be wet. I love a good gilet myself, keep the body dry, let the arms radiate heat, who cares if you have wet arms? Unless it’s really cold in which case a full on jacket is fine.
Failing that you want vents, and vents on your vents. My newer Altura Attack has pit zips that go round probably half of the jacket, lovely (but a pain in the bum to undo!)
(my Altura jacket’s very breathable but I can’t wear it unless it’s cold, I can barely get away with a long sleeve jersey tbh, I run too hot)