I have one of these https://www.macpac.co.nz/clearance/m...sz=12&start=54 and its bloody awesome, fills the gap between being solely a base layer and being able to use a standalone item in a range of temperatures, its kind of like a base/mid layer rolled into one.
Use macpac merino Longjohns also. Have a pair of the warehouse merino longjohns and they are extremely light and the knit is reasonably open so they stretched heaps very quickly.
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