I use a cheap-ass macpac fleece zip neck or a cactus fleece. they're warm & weigh not much. also a macpac ultralite down jacket for extra warmth
softshells suck (they're not as good for warmth as a fleece, weigh&cost 4x as much, not as good at being a wind/rain shell as the hardshell you already should have, and as for breathability, just don't wear any sort of shell when climbing/walking unless it's raining.... in which case softshells still suck because they absorb hella water)
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