Perfect cold weather base layer.
What to pack for two weeks in Southeast Alaska in early May ... Mountain Hardwear Power Stretch Zip T and Tights, Smartwool Microweight LS Crew and Tights, The North Face TKA 100 Zip in a cool color, REI Mistrial Pants (sorry Altrec ... need to offer more womens tall selections), The North Face Nimble Zip, Arcteryx Beta LT Jacket and Pants. The Mountain Hardwear Power Stretch Zip is warm and soft and stretchy ... paired with the tights it's the perfect base layer ... as well as super sleepwear for those cold nights.

Great!
Very warm and very comfortable. The fit is very good, but the neck can be a little tight. It would have been nice if it "looked better" to wear it on its own. By this I mean that the collar lays down in an awkward looking was so I use this only for layering...which is its real purpose. Very happy with the garment!

Best ski shirt ever
If you want maximum performance from a lightweight yet really warm winter shirt this is it! It keeps me warm in sub-zero temperatures when tele-skiing and doesn't feel clammy when I heat up. It is form fitting but doesn't bind up in the shoulders or arms.

Best powerstretch garment on market
This piece would be PERFECT, if only Mtn.Hardwear would add a zipper garage to protect the neck from the double-sided zipper pulls & the nylon trim used to "cap" the top of the zipper assembly. The dual sided construction is a nice feature for a layering piece: layer the smooth side in for wear over a performance-T, or smooth side out for use with fleece-lined softshells. As far as warmth to weight for bottom layers, nothing beats powerstretch: I wore this piece alone with a softshell and was comfortable well down into the 20s skiing at 9000+ ft in CO with 10-15 mph winds.

My fav long sleeve shirt
So flexible and comfy, I got 2 of them. Fits as described.