Knit Moving Comport Sports Bra with Racerback 88% polyester Junior and Contemporary S/M and L/XL Size. S/M fits XS-S (0-4) US sizes: Bust:25"-32" Band:23"-30". L/XL fits S-M (4-8) US sizes: Bust:27"-36" Band:25"-32" Stretchy and Comfortable Moisture Treatment 88% Polyester 12% Span