Good baselayer - Mammut Eiswand Zip Pull Light Pullover - Mens

This is a nice baselayer but it depends on how much breathability you want and how hot or cold you run. It's a mid level baselayer. Not super thin but not as thick as their Aconcagua fleece jackets, which I use as a thick baselayer. It has grid fleece on the inside which is warm, but there is a lot of spacing between the grids. That makes it more breathable, but it also decreases how warm it is. The high neck is great but the cuffs and sleeves are kind of loose. It looks nice as well. If you run hot or are using it as a baselayer for active pursuits when it isn't bitterly cold, it's a good option.