Train like the pros in the Men’s Under Armour HeatGear Long-Sleeve Training Top, designed for peak performance from the training room to the arena. The original Under Armour long-sleeved baselayer takes your workout sessions as seriously as you do, with an ergonomic, super-lightweight design comprised of breathable materials, sweat-wicking technology, and ventilated panels for strategic ventilation where you need it most when you turn up the intensity and break through plateaus.