Marvel Phases of Moon Knight Girls Tanks Moon Knight's superpowers are influenced by the lunar cycle...so it must be a full moon because the Marvel Phases of Moon Knight Heather Royal Blue Racerback Tank Top is especially awesome today! This blue Marvel shirt features one half of Moon Knight's face paired with one half of a full moon, to complete the circle, with the phases of the moon displayed below. 50% Polyester, 25% Cotton, 25% Rayon.