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.nastyJust whatever you do, don't get anything with down if you ever want to tour with it. Down is great for insulating but almost useless as an active layer since it doesn't breathe.
KevskiSecond this. Not to mention it doesn't keep you warm when it's wet. Pretty sketchy if you're touring some deep backcountry zone and your down is wet and can't keep you warm if you need it.
I often bring a down layer when I tour but I only take it out when I need that boost at lunch or for if something bad were to happen and I'm stuck out there.
whatsamonadYESSIR thirded. Never use down when skiing. It will NOT keep you warm because if it gets wet it loses all of it's warmth, and it' doesn't breathe well so you will sweat, then the sweat will get it wet and make it lose warmth.
My suggestion is get a Proton LT from Arcteryx. If you want something REALLY warm that's still pretty thin, I'd get the Atom AR from Arcteryx (I'm partial to them but they make some of the best shit you can get, especially for midlayers). Proton is gonna be some of the best performance you can get in a thin midlayer that's still warm. Extremely breathable yet still very warm, so you can unzip your shell and vent really easily if that matters to you.
If you want to go MAX warmth, get the Atom AR. It's still "thin" but it's not gonna be very thin like the Nano Puff or Proton LT. However, it's still plenty thin (I wear it over a fleece and under my shell) and it's very very light for it's warmth.
I'd personally recommend one of those two based on whether you care more about breath ability and thinness (Proton) or maximum warmth in a thin midlayer (Atom).
I own both and they are both amazing.