I dont know, but i will say this. Pops always wore wool sweaters and carried a spare when backpacking. That was old school. Wool keeps you warm much like syn can even when wet. However, man is it heavy. I highly doubt it will hold a candle even to synthetic weight wise? I could be wrong, but wool isnt light bye old school standards. Merino has come along way! Unless some new tech has come along, if weight is a concern? I am doubtfull it will compare???
I still have pops old wool sweaters, and wear them when hunting and cross country sking. They are great for that , but backpacking they are home in the trunk!