Hello Dawn, The lifespan of our products are all specified in our technical notices, they can be downloaded as a pdf on each product page. In addition our helmets are Personal Protective Equipment and need to be inspected on a regular basis. Please consult this link for more info http://www.petzl.com/files/all/technical-notice/Sport/A42-ELIOS.pdf http://www.petzl.com/en/ppe-checking Thank you for your support