WHAT’S IT DO? The Men’s ColdGear® Longsleeve Compression Mock isn’t your old-school mock turtleneck. But you knew that. We don’t build stuff that just looks good. It’s gotta work harder and better. Our mock does, with smooth, sleek, dual-layer construction. Use it to layer up or wear it on its own. Either way, you’ll be ready for the weather’s worst with a soft, brushed inner layer that circulates heat, and an element-battling outer layer that keeps you dry and protected. The real game-changer, though, is the fit. The super-tight, second-skin fitted longsleeve squeeze of UA Compression activates your muscles for increased power. You’ll know it when you feel it.