I have worn it in almost every condition and it hasn't let me down yet. I have used it as bottom layer on -30F degree days and it is a great all around shirt. I really enjoyed using it on cool days alone as well as light summer snow in Antartica, although it does get a little warm. Great buy.
This person is part of our Field Testing program and may have received this product for free. We operate one of the most rigorous field testing programs in the business.
The long sleeve shirt that I bought is an XL. It is a little small for a typical XL shirt. I would recommend getting the medium if a small is your size, and you should be good. Also, if it's still a little big, then an undershirt would fit very well.
I think it fits perfectly. I have long arms & I hate when sleeves slip up between my wrists & forearms. These shirts don't do that. Very happy with the fit & quality. These shirts are thick & heavy duty .