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There's no way I'd trust it down to minus 2
That's the extreme rating:
Extreme — the minimum temperature at which a standard female can remain for six hours without risk of death from hypothermia (though frostbite is still possible).
These ratings are taken assuming that the subject is using a sleeping pad, tent and is wearing one base layer of thermal underwear.
So you won't die at -2 with extra layers but it isn't going be a pleasant night
frankenbike
100g of down doesn't strike me as much, even for summer. Good FP though. There's no way I'd trust it down to minus 2, but if you can trust in the weather, and you're not going to be at altitude, then maybe it'd be ok?