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then if you can afford it, you want 2 garments like this
1, a very thin polyester windproof layer, pic related is for climbing, a rab boreas
2, a decent light rain shell, pic related the outdoor research helium II is a good option
they layer well and you don't want to wear your rain shell unless it's raining as it won't whick sweat all that well. You want both to not be insulated at all and to be very light and compact to keep in your bag.
