Awesome product! Very similar to my poly pro that I've had since 2006 when I joined the Army. Great combo with top, and bottom of these combined with gortex top and bottom. Keeps you warm and dry
Warm and light
Awesome warm/weight ratio
Keeps you warm without weight
This shirt is great for all cold conditions. It is warmer than any other shirt I have used at this weight level, and does a surprisingly good job of keeping you cool if you overdress. I have worn just this underneath an ACU blouse in the high 30's-low 40's and felt comfortable outside and then gone inside and felt comfortable as well. Definitely worth getting if you can afford it.
One note about the fit. This shirt is fairly form fitting and the neckline is higher than a normal shirt. I have a 36-38 In chest, and the small fits, barely. If I were to buy another, I'd get a medium. The material does not really stretch, and while there are no comfort issues, the shoulders pop up when i raise my arms.