The actual manufacturing process is a closely guarded secret, rubbish!
Anyway what are we all talking about, just looked at chain reaction and the new Campag waterproof is a whopping £439 so it MUST be waterproof and MUST be breathable if not how do they justify the cost.
Event is more breathable as the holes are larger but also means that its not as waterproof although I,ve never really noticed this. I have a gore fusion and an Endura event, the event is more breathable and the gore better suited to really awfull cold and wet days both are brilliant!
Having said all this I only wear them when I have to