Take on the world in the Under Armour Men's Project Rock BSR Sleeveless Tank Top. It is made of 60% cotton and 40% polyester. The crew neckline is ribbed, and its dropped armholes offers a greater range of motion. The tank is personally approved by Dwayne Johnson. Under Armour Men's Project Rock BSR Sleeveless Tank Top Black, Small - Men's Athletic Performance Tops at Academy Sports