I recently bought an Endura jacket for MTB’ing. They do a variety of types, colours. Small enough to live in my camelback till needed. Not too expensive that you cry when you ride through brambles wearing it.
Also not super expensive because it claims to be breathable. I dont believe anything is breathable for proper mountain biking. When your in your lowest gear, breathing out of your ass up a long, steep Welsh hill, sweating like Sumo in a sauna, nothing works.
They work fine at keeping the rain off, also comes with a detachable hood.
I figure it will work well for a few years then die, like all my other waterproofs despite re-proofing them. Never seems to work as the adverts tell you. So buy a cheaper jacket and expect a few years use rather than an expensive one that never lives up to the hype.
Of course, for road riding its a different matter, higher speed, less sweating – then breathable can work. But roadie jackets are even more expensive, but they do last years.