I have been using Under Armour for predator hunting the past two winters...The Cold Gear works outstanding and it allows you to hunt in sub zero temps. While I do not pay top price for this stuff... I pick it up at TJMAXX, Ross, and Marshalls and have gone to the Under Armour outlet
at Tannerville and Lancaster.
I like it so much that I might even start to pay premium price if I need the stuff bad enough..
The Heat Gear also works great for picking shrooms in the summer heat...
http://www.underarmour.com/