Under Armour RUSH™ is an infrared technology that returns energy to your body so you can train harder and recover faster. Insanely lightweight, breathable and comfortable fabric with no distractions. The 4-way stretch fabric ensures greater freedom of movement in all directions. The material wicks away sweat and dries very quickly. Classic racerback design for full freedom of movementUnder Armour RUSH™ is an infrared technology that returns energy to your body so you can train harder and recover fasterInsanely lightweight, breathable and comfortable fabric with no distractions4-way stretch fabric provides greater freedom of movement in all directions