It works great at getting the perspiration/moisture away from your skin which in turn makes you feel a lot more comfortable. I used to wear cotton t-shirts under tons of layers and a huge parka, I'd get warm, sweat a little and thenI wouldfeel cold. Now it is just some under armour and some fleece and a weatherproof outer jacket and I am set. The moisture wicking was huge for me. The gloves have been a life saver. My wife got me some stuff from LL Bean that is similar to Under Armor but a fraction of the cost for work and I think it works about as well as the UA.

Works good when using it properly in your layering system. It is not designed for nor will it stop the wind. It is a base layer only, but it works well for that.

go to sierra trading post and buy the wicker underwear, works just as good..

I have found that the UA "knockoff" stuff from any clothing store is very good for this. It is thin polyester, has the small holes in it,it dries very quickly, and is usually less than $20 for the top or bottom. I can stay warm in just this thin shirt and a fleece pullover down to around 38-40 degrees, then a thin insulating jacket does great down to around 25 or so.

Here is my layering system on those cold days under 35 degrees. This beats out what I would wear a few years ago..no bulk and if it warms up, remove the Pullover.
UA Coldgear
UA Pullover
Sitka Mountain Shirt
Sitka Celcius Vest
Sitka Celcius Jacket

UA Cold Gear works great! I use an outer garment with a wind barrier and I have No problems at all. Last year I was warm even at 15 below zero. Nothing will keep you warm if you don't stop that heat robbing wind

Dan