Filmed on 11/13/07 - The Running Event - Austin, TX - Eric from Lock Laces discusses the product and mentions they will not break, won't dryrot, and they're water resistant.  They're are made of the same materials as bungee cord and are very durable.  Lock Laces are a shoelace replacement that are intended to be easy to tighten and untighten, are easily adjustable, and will never come untied.

Interview by Kevin Ullman

From locklaces.com

The Last Thing You Need To Worry About Is Your Shoelaces.

Lock Laces^TM are a patented* “elastic lacing system” that feature specially designed elastic laces combined with a spring activated locking device.

Lock Laces^TM are great for running, triathlon, playing sports and casual wear. Lock Laces^TM are also ideal for children, the elderly and the physically challenged. Wear Lock Laces^TM with all styles of running shoes, athletic shoes and casual lace-up shoes for any desired use.

When using Lock Laces^TM, you never have to stop to retie your laces during any race, sport or activity. With Lock Laces^TM, you can simply slip your shoes on and off, no more tying and untying laces or double knots! Lock Laces^TM provide convenience, superior comfort, more flexibility and a better fit compared to cotton or nylon shoelaces.