Great looking, great quality. Fits a little tight under the armpit - but maybe it will stretch a bit in time. I am 5'11" 160lbs and a Medium is the best fit. Went with the Paprika so pretty sure I wont be lost in the backwoods. Pricey, but it's Arcteryx, worth every penny.

Excellent
Know what you're getting into: this shirt is sized as a tight base layer. [sel-ect ]your size accordingly. I normally wear a medium, and a large gives me a looser fit on these shirts but the sleeves are the perfect length. They are very comfortable, provide great warmth for their light weight, dry quickly, and look excellent. The pocket is handy for something small. I wish the zipper were a little bit longer. My favorite color is the mahogany. It looks very nice.

Great piece, not for me
I thought this would be a little heavier and not such a close fit, but it is what it is, another great Arcteryx piece with a great fit and a great collar. It fits close, think Under Armour. It is nice like I said, just not what I was looking for. I am 6'0", 150lbs, and a medium fit me like a champ, plenty of arm length and plenty of length in the back.

great zip top
A great base layer. It's so comfortable I don't even want to take it off after skiing. I love the chest zip pocket too.I like it.

Great!
Just got one of these, and the fit and quality are typical of Arc'teryx (better than pretty much anyone else). The material is quite light, but provides a fair bit of warmth. Likely to be a bit too hot if you are really working. Does not bind under other jackets. beware, the size chart is a bit misleading, as I would personally go for the next larger size than what is recommended, especially if you are tall. I have a 38 chest, so I ordered the small, which felt like it was painted on and did not even cover my belly button.