I agree, UA makes good quality garments. I wore UA heatgear baselayers under a pair of UA fleece lined camo pants and a Scent Blocker Dream Season baselayer long sleeve shirt and a UA blaze orange hoodie. I was comfy and warm right up till the freezing point!
I was impressed to say the least. Even once the temp dipped below zero, all I did was add a fleece vest under the hoodie, and I was once again completely comfy and warm!
Probably wouldn't be as nice if you are planning on sitting for hours on end, I tend to do lots of walking, then sitting for an hour or so, then doing some more walking.
Thats where I became even more impressed! Before I started using the UA stuff, I was either comfy when sitting and sweating while walking or I was freezing while sitting and ok while walking. This stuff works wonders as no matter what I am doing, sitting or walking, I am completely comfortable and dry.