Perfect light to mid weight base layer.
I could not be happier with these. They are super soft. Unbelievably comfortable. The seams on other base layers I have worn have bothered me. I don't even notice they are there on these. Warmth wise, well they are a lightweight pair. Although, they are warmer than other lightweight layers I have tried. Perfect for snowboarding or other winter activities during a Utah winter, which is exactly what they are made for. However, not the best for high mountaineering unless you have some other significant layers on.