This specially engineered fabric delivers a unique type of softness that can still wick sweat like a champ. It's lightweight, it's breathable, and it's ready to work. Ultra-soft fabric is breathable & comfortable. Material wicks sweat & dries really fast. Built-in shelf bra for added coverage & support. Criss-cross strappy back design. . . . . . . 90% Polyester/10% Elastane.