switchback said:
This, in my experience is not likely/possible. A jacket with an internal waterproof barrier does not ventilate effectively. Vents open but the jacket just puffs like a balloon because the Gore-Tex like barrier stops the air flow. A jacket with a removable liner will breath and can be made very water resistant with some scotch guard like substances and the added liner allows for complete protection from the elements. In Malaysia, I would be tempted by a good mesh jacket with an additional rain jacket.
Have you ever tried an Aerostich Darien? Built in GoreTex membrane and vents that open completely and let plenty of air flow thru. The unlined Goretex inner membrane, however is a bit rough and I always wore a long sleeve wicking tee under it. I think that if they put a sewn in thin perforated nylon lining like many jackets have, it would be perfect. Oh, yeah, if I were designing it, it would also have a pouch in the back for my water hydration unit. Why won't Andy listen to me? ;D
I really don't care to carry an extra liner along that takes up room and requires me to stop, take off my jacket, get it out of the saddlebag, and put on underneath. Just my personal preference, but I have tried it both ways and for now, will always choose an internal waterproof barrier.