Zone 3 Elastic LacesFeatures Top of the range, heavy duty elastic cord laces with a spring loaded lock are perfect for speedy transitions. You simply replace your laces with these elastic cords, use the dual cord stopper to adjust the tension, and tie off the ends, so they dont slip through the cord stopper. The ends of the laces are also shrink wrapped to prevent fraying and have a built in reflective weave for night training. The elastic laces are strong enough to be