Streamlined, tech-inspired aesthetics. This sporty black Muscleback features a dynamic curved graphic design spliced with a red and blue plastisol print. The muscleback style offers flexibility during your fitness training and includes a medium back opening, so you feel confident and secure as you move through your workout. Made from our ECO Endurance fabric, it's quick-drying and 100% chlorine resistant. Plus, one of the yarns in the ECO Endurance fabric is made from 100% post-consumer waste, such as recycled plastic bottles.