When you're giving it your all, you need an extra breathable top. It needs to be lightweight, quick-drying and loose-fitting so you can train at full power: the Vent 2.0 men's shirt from Under Armour. The incredibly breathable knit fabric is super lightweight and comfortable, wicks away sweat and dries very quickly. The 4-way stretch fabric provides unrestricted freedom of movement in all directions. An extended and shaped hem improves coverage during workouts.