Over time shock cords lose elasticity and eventually fail, but with the MSR Shock Cord Replacement Kit it's easy to give your tent a much needed upgrade. Detailed instructions walk you through the process and the kit contains all the materials you'll need. And the silicone-core shock cord outlasts natural rubber and will stay elasticized longer than standard cords. Just because you're tent is old doesn't mean you need to get a new one, just give it some TLC with the MSR Shock Cord Replacement Kit.