The Nathan Lock Laces allow you to personalize your look with the world’s easiest lacing system, patented and elasticized for convenience, security, and speed. Lock Laces provide stretch-fit comfort and locked-in safety for all sports and casual use. Lock Laces are a necessity for runners and triathletes improving performance and transition times. Lock Laces are one size fits all. Lock Laces are 48" in length and can stretch to 72" in length.