Merino long handles top and bottom I wear the tops as my shirt, microtex pants, some kind of puffy jacket and vest. Marmot precip pants and jacket. Lots of days i end up taking the merino bottoms off as it warms up. I've tried smartwool and ice breaker, both work well but I think I prefer the smartwool.

I'm sure there is better and lighter but this has worked for me hunting and guiding in Wyoming.