love this base layer. It breathes well and extends the range of some of my lighter weight jerseys. For cool mornings when its going to get hot later, or for rides in the mountains, this thing is a workhorse. Wish the cut was a bit longer though, thus the four stars.
Extremely comfortable. Surprising warmth for what feels like a very ephemeral material. Merino, so it's stink resistant. Wouldn't say no to a long sleeved version (hint hint)