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Alpha really is a miracle material IMO. I love it so much. People make it out to only be useful for insulation with a windproof layer, but I disagree. I've used alpha tops while riding and while it still lets a breeze through, its still warm. Add a wind jacket and its really warm. Dries unbelievably fast, too.
I'd also consider buy something made out of Apex but as Apex is a down alternative, it does really suffer in its longevity and loss of loft versus down. Where a down jacket will last for a decade+, Apex might last for a few years. In all but the wettest of environments - so basically the Pacific Northwest and Scotland - down wins IMO and many other peoples too.
But that is quite backpacker specific. For bike stuff, I'd just trust whatever Albion are doing and buy that. They're really pushing the boat out with regards to synthetic jackets.
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JB
and from that, another interesting read (well, interesting for me because I want a synth jacket/gilet)
https://www.backpacker.com/gear/the-ultralighters-guide-to-synthetic-insulation/