Speedo Women's Endurance+ Side Shirred Tank One Piece Swimsuit 50% Polyester, 50% Pbt Tank one-piece swimsuit featuring scoop neckline and shirred bodice Four-Way Stretch and 9 Thread Flatlock provide a body-hugging fit and great shape retention Ultra chlorine resistant fabric designed to lasts 20 times longer than conventional swimwear fabrics. Core Compression features strategically placed mesh compression fabric that trims and slims for the most flattering fit Contour back styling features a lower cut back with wide straps for support and a comfortable fit