Agree mostly with above but replace fleece with a nylon type thin breathable long sleeve top ie Stoney creek fasthunt, Earth Sea Sky etc. These are cooler in summer i find wear better and save getting sunburnt on the tops as i never remember sunblock. Fleece is an ok compromise if you already have it but i find a long sleeve fleece top way to hot for climbing. biggest advantage of fleece is it is cheap.
Disagree on lightweight puffer. Buy a good one with high loft down as they aren't that expensive $225 will get you top of the line if you can weight for a macpac sale. it makes them way warmer. I dont fancy leaving down jackets on the outside layer a they get torn easily so one that can be layered is great. I dont wear it if (i am covered in undried blood or am sweating) so doesnt get gross at all. Put its in a dry bag in you pack like all you base layers your not wearing should be and good to go.
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