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In theory Breeze Dry-Tec is as breathable as eVent but I've had no direct experience with it - Miguel may be able to chime-in.
Back in 2007 I did the Tour du Mont Blanc. I wore a Montane Superfly eVent jacket on the rainy days. I had always thought eVent was superior, but on my trip the Superfly got completely soaked on the outside and the wetting out of the outer fabric caused me to go almost become hyperthermic in the cold. My teeth were chattering badly and my lips turned blue. I immediately stripped it off and just wore my Montane Litespeed wind jacket with two base layers underneath, and in the rain, all day I was warm and dry. I never used the Superfly again after that on that trip.
That hadn't been the first time that had happened with the Superfly. When I first bought the jacket I again came close to getting hyperthermia and had to change to my wind jacket to regain warmth and protection from the wet. I've since checked and rechecked, carefully washed it and used both Nikwax Washin-In Direct and Grangers, then did the strong shower test, but the problem always recurs. I'm not sure if the eVent layer itself is wetting through, but my one experience with an eVent jacket has made me very wary about spending more money to find out whether it's worth using it. It could very well be the outer fabric which is the culprit, but I don't have the cash to casually try out another jacket. That Superfly was very expensive!
I've used Breeze Dry-Tec quite a lot and it works very well for me. I tend to not mind getting a little wet (soaked is different) as long as I'm warm. I think Mont Bell's rating of the rain jackets is very accurate, mainly because, with Japan having so much torrential rain, it is important for Mont Bell to advertise the correct ability of their rainwear. That being said, Japan is often so hot and humid in many cases wearing a rain suit, like those made with Gore-tex, can be a very hot and wet-from-the-inside experience.
I use the Breeze Dry-Tec U.L. Sleeping Bag Cover all the time now. I find it works better than my BPL Vapr Bivy because it is waterproof, breathes very well, and doesn't have a silnylon floor, which tends to roll up on top of me while sleeping (unless I stake it down) and the condensation from my breath soaks my sleeping bag and clothes. So far I've had zero condensation problems with the Breeze Dry-Tec bivy. I'd recommend getting the "long and wide" version to accommodate your sleeping pad inside, or if you are taller.
I'd say Breeze Dry-Tec is perfectly adequate for the Alps. I did perfectly well for one week after the incident on the Tour du Mont Blanc with just a wind jacket and warm base layer, even in the rain, though I would like to have had my Mont Bell Versalite Jacket with me for a little extra protection. I also experienced two days of getting snowed off the trail, but the following day the snows retreated and it was easy walking.
Even though I am used to climbing in the Japan Alps (which are much rougher than the popular walking routes in the Alps in Europe), I was mentally unprepared for the much higher peaks and the "hugeness" of the weather. It felt much colder and darker than the mountains in Japan. And that, traveling alone in a foreign country and unfamiliar mountains, was daunting enough sometimes to make me doubt my ability to finish the walk. But as I took each new step and woke to another day of walking and got familiar with things there, the fear gradually subsided and I just took conditions as they presented themselves.
Andrew Skurka, in a reply to an email I asked him about preparing for the long walks he goes on, once gave me this fantastic advice: "Don't pack your fears". It really makes you think about what you are bringing, but also how you see that place you are attempting to walk.
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