I've used it for almost a year now. I use the Cold Gear, but have a topsimilar to the Warm Gear in another brand. It works by compression and moisture wicking. I feel less tired because of the compression on my muscles, and there is no trapped ordead air because it conforms to your curves. The Cold Gear has a thin lining that adds warmth. I swear by it. I've worn it on rainy days and didn't feel clammy because it keeps the moisture off your skin. It dries super quick, and it helps retain heat. It alsoretards odor. The Warm Gear, which is for milder weather, doesn't have the thin lining, but it works the same way though. They also have Loose Gear that thin but is not form fitting. I've known guys who were using Under Armour for huntingwhen it first hit the scene in the athletic world andbefore it was known in the hunting world, and they still wouldn't hunt without it. I won't either. I sometimes wear only my Under Armour under my Gore-Tex rainsuit on warmer rainydays to keep me from feeling clammy and wet from perspiration. I don't knowif you need camo Under Armour since it is anundergarment. Mine is olivebrown, and it works just fine for me. I probably wouldn't get white though. Wow, I should get a salary from UA.

Shannon