This shirt, although incredibly comfortable and soft (a sort of silky feeling), doesn't stay put on runs. I find myself constantly pulling it down in front- it wants to move around too much while running. It wicks sweat away from you well at first, but with a more intense run/exercise, it gets wet quickly.
Good for a comfy tshirt, but a bit of a hassle for exercising.

This tshirt provides adequate coverage while keeping you cool. The fabric wicks away sweat well. I wear it while working out in the gym or on runs, and it works great.
I was expecting it to be a little tighter like other Under Amour gear, so I ordered a bit big, but this tshirt is looser and less fitted. I would get your usual size.

I really like this shirt. It's fitted just right- not baggy or skin tight. The fabric wicks sweat well. I run in this shirt and it keeps me dry and comfortable. The side mesh-like panels also help me keep cool. It's also comfortable and has a look like an tshirt, allowing for more everyday use.
I haven't been able to try it backpacking or in temperatures above 60 yet, but so far, so good.

I wish there were a way to have the tubing from the Camelbak water pouch stay on the strap. It's hard to get to water on your back.

I still can't figure out how to use the daypack, though. Somehow the top is supposed to transform into one.

Other than that, the back support/hip belt/chest strap work PERFECT. Good mold to the back while staying steady.

I went backpacking while it was drizzle-raining, then snowing and NOTHING got wet.

The side and bottom access points of the back are very helpful, as well as the side stretchy pockets for waterbottles.

So far, this jacket has kept me warm, but I know that the winter is going to be much colder. We've already gotten 2 feet of snow, and the temperatures are in the teens, and the jacket is holding up fine. I know that when it gets colder, then I will have to wear additional insulating layers to keep me adequately warm. The only thing I'd change about it would be adding more insulation.