Nathan Lock Lace Add security to your exercise, workout, or run with the Nathan Lock Laces. These laces are designed to stay locked and secure during lengthy or intense activities. Stretch-fit allows you to get a comfortable fit while maintaining peace of mind as they stay in place. These water-resistant laces make your running shoes easy to slip on, while helping your feet stay dry. 48" in length. Sold as pair. One Size Fits Most.