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And walking around a warm house isn't exactly the best test of a piece of cycling clothing?
So you're saying I should test it by riding it and then invalidating my opportunity to return?
I guess that's why someone with a modicum of intelligence would be able to replicate the right conditions for them personally based on the amount of time spent on the bike and knowing other situations that they think would be comparable.
I'm honestly not joking when I say a bin bag would serve the exact same purpose. Considering it's the same price or more expensive than a jersey, I'd rather buy another jersey, or a gilet, and just keep a kitchen bin sized bin bag in my pocket at all times, much more cost effective. If I'm just going to whip it on as a layer when I'm stopped, it doesn't need to be technical beyond being packable.
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As mentioned upthread the PT Lightweight Wind Jacket is what you're after. It packs down pretty small (though not as small as the Brevet Jacket), but with a mesh back you won't have any problem with breathability. It's a great piece of kit and there are still a few knocking about in the Archive section. Much better product IMO.
I would have thought that something so light keeping you very warm would be something useful to have on a ride, as @gillies said if you've stopped for a mechanical, cafe stop, or it gets cold suddenly - from the description its purpose is more as an emergency extra layer that barely adds bulk or weight to your pockets, rather than something you wear from start to finish of the ride. And walking around a warm house isn't exactly the best test of a piece of cycling clothing?