I love the 150g/m2 weight merino wear. This top is a great baselayer, and the black is substantive enough to wear alone. Honestly, for comfort, I prefer the Icebreaker Siren. It has more of a scoop next than the SmartWool V-neck. However, the SmartWool Microweight bottom is my favorite merino legging/long underwear. NOT ITCHY!