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Big_Ted
Well their zips don't unzip themselves so IMO that would be a bit crazy. I've had my Zoa for a year.
Think about it this way: you are smarter than any jacket. One way zip is either "jacket is working" or "jacket is making me hot" [unzipped]. Two-way means you can closely regulate your temp beyond the limits of the jacket fabric without parachuting around the lanes and flapping out like a bastard