Breathability and Range of Motion.Colour: BlackThe Nike Block Girls' Tank Top delivers the ultra-soft, ultra-light feel of a rayon fabric blend with the unrestricted mobility of a racerback silhouette.Fabric blend is ultra-soft and ultra-lightweight.Racerback design allows a full range of motion.Reinforced shoulder seams enhance durability.50% POLYESTER 25% COTTON 25% RAYON