Comments about Under Armour Under Armour Women's Subzero Long Sleeve Mock:
I just purchased and used this for a snowboarding trip to Colorado. It was perfect for the cold weather, so much so that I didn't need a fleece layer on most days. I also had an opportunity to use this during a 30 below tennis tournament, where all I wore was this and a sleeveless fleece jacket. I wasn't cold the entire time.
Not only does it adequately keep you insulated, it looks and feels great! I plan on getting a lot of uses out of this, and know 100% that it will keep me warm!