Arena Women's Swimwear Size Chart Get back to basics with Arena's solid color classic. The Mast one-piece offers maximum comfort, streamline design lines, maximum range of motion and zero distraction to keep you comfortable lap after lap. Its Light-Tech Back style combines a sporty look, extremely comfortable fit, and contemporary feminine style with maximum range of motion. Feel the difference your training deserves with arena's highest quality practice and training swimwear. Features: - MaxLife fabric has low drag, excellent shape retention, and chlorine resistance - High neckline - Light Tech back silhouette - Regular cut leg - UPF 50+