Marvel Iron Man Invincible Heart Girls Tanks Iron Man's heart hit a few rough patches but he always pushes through with the Marvel Iron Man Invincible Heart Heather Red Racerback Tank Top. Your heart can be just as invincible as Tony Stark's with this awesome red tank top that has Iron Man framed within a heart and "Invincible" below him in white script. 50% Polyester, 25% Cotton, 25% Rayon. Designed with raw-edge hems.