This is another great item from Arcteryx. Not uncommon with Arcteryx, this item is very expensive but the product is worth it if you are out using it all the time. This is a great shirt as a base layer thus it is very close fitting, so do not expect to get any layer underneath it. Although it has a very contoured fit it dose not feel restrictive at all. Some people complain that the Merino wool is still a little itchy for them, however I have not found this to be a problem. I have worn this shirt mile after mile running, snowshoeing and camping and it dose not get stinky like Capilene. Overall this is a great product and has replaced almost all of my other Capilene base layer shirts as I don't get around to wearing them now, only when this one is in the wash. A little expensive, but worth it.