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LOCK LACES provide locked-in safety for runners and walkers. These unique laces fit any type of trainer that uses a lacing system. They provide a never-come-undone, never-tie advantage. LOCK LACES are a necessity that improves performance, so you can Win. Never tie. LOCK LACES provide stretch-fit comfort and locked-in safety for all sports and casual use, and are a necessity for runners and triathletes to improve performance and transition times. LOCK LACES are one size fits all. LOCK LACES are 48″ inches in length. They are elastic, and can stretch to 72″ inches in length.