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Burner from Albion
Is not a replacement for an insulated gilet in my opinion. It doesn't block the wind or have the same level of coverage as a gilet.
I have both and often wear both in the morning, take out the burner when I'm warm enough and then ride with the gilet open when it's later on and I'm fully warmed up.
Don't really need to pack a gilet away as when it's open, it's barely touching your body anyway
Burner from Albion will do this job better than a (edit: another) gilet. Packs smaller, too.