Excellent!
I have 2 of the Rho ARs. They are quite warm but not too heavy. I use it for a general layer when I'm out in the cold but I also will wear it during cold runs. It wicks the sweat away very well given how heavy they are. I find a lot of uses for this versatile shirt. My only complaint is they are cut kind of short. It's not bad when my arms are at my side but I definitely flash the belly when I put my arms above my head. This is a common complaint I have with shirts. I usually buy shirts in small even though I see this problem. I'm 6' tall weighing in at 160 pounds.

love it
I love this top, it is flexible and fits great! I use them primarily for ice climbing and it has performed awesome!

Excellent for Skiing and Snow
This is a great top to wear over long johns or a turtleneck for skiing. Its nicely tapered and fits neatly under a ski jacket without any extra bulk. I tried the women's sizes, but they were too tight in the bust, the men's sizes were a little more roomy and look identical except the small pocket is on the breast instead of the sleeve. It is very comfortable material and warm!

Excellent layer
This is the second top I purchased since I lost a lot of weight and the large is a bit too roomy for me. The fit of the top is nice, although I find the medium to be a touch too short but the large to be too baggy around the waist. The material is very warm but not too warm, a great alternative to my Hercules jacket. I highly recommend this to everyone that's looking for a warm layer that can be warm enough for cold days when used with other layers.