TYR Men's Tracer Light Racer Swim Suit Tracer Light is constructed from the strongest microfiber available and distinguishes a significant progression in chlorine resistant racing fabric. Specifically developed to eliminate water absorption, drag, weight and, of course, doubt. Training doesn't push your body to the limit, it changes the limits of your body.As you train, your heart and muscles adapt for more efficient athletic performance.Heart rate and stroke volume increase to pump more oxygen to your muscles more rapidly. Conversely, your muscles adjust to extract more oxygen. Tracer Light technology maximizes these essential athletic training and performance benefits with the right compression in the right places, to let your muscles breathe.