I have one of these shirts that I use for rugby practice and games. I love the Under Armour brand, both for the quality of their products and top-notch athletic styling. It's not too clear on the Amazon page about the different fits of UA stuff, but this shirt is definitely the compression style fit. Meaning it's a very snug, second-skin type of fit, great for layering under shirts or sweatshirts. My only gripe is that I'm quite a bit taller than average, so the sleeves are a bit short and it's tough to keep the bottom of the torso from creeping up while running around. For most people, I doubt this would be a problem. It's the "Cold Gear" line, which means the material is a little thicker and heavier (and more expensive) vs. the "Heat Gear" line. Highly recommended.