Under Armour began with a mission to replace traditional cotton t-shirts with high-performance fabrics designed for athletes. The collection focuses on essentials for peak performance, including base layers and training tops. Its moisture-wicking technology pulls sweat away from the skin so it dries quickly. This feature is found in HeatGear®, which helps you stay cool in high temperatures. Under Armour also offers ColdGear®, a dual-layer fabric that circulates body heat to keep you warm without adding extra weight. Under Armour is known for its compression fit. This is engineered to reduce muscle fatigue, helping you recover faster after intense training.