Those are the ones I have, three of them and I am going to buy a fourth. With the MEC merino briefs or IB briefs IF you can ever find them, underneath, you can wear a merino T, merino longlsleeve and then use Primaloft and/or eVent insulation/shell over these.

This is the lightest, most versatile system I have found in decades of trying everything and the one I will stick with. I have tried the various synthetics since they first became available and NEVER found one type that is as comfy at a variety of temps as merino is and they ALL tend to smell after very little wear.