/ The Knowledge..lightweight primaloft-Down under Goretex
I've just bought a very slimline uniqlo ultalight down jacket for a very reasonable 60 quid which would fit under my goretex fine, but I suspect it wouldn't work brilliant there, so why my question is why do you a down jacket under a shell?
Do you not find you get damp inside them? I was quite surprised but when I tried the marmot variant as a mid layer that if I was working hard I got sweat building up inside. Doesn't seem a problem when they are your outer layer.
I know a couple of people that wear a Arcteryx Atom LT hoody under their goretex for winter climbing, they run cold and it's an easy way to avoid having to wear two bulky fleeces as the mid layer.
Montane Prism, though if you're belaying for any period of time, you'll need to add more.
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