If you’re a runner, experts recommend that you change your shoes every 500 miles. But if you’re not a fan of counting (or don’t run unless you’re being chased) don’t worry, Apple’s got your back. A July 2012 patent filed with the U.S. Patent and Trademark Office details shoe design set with sensors to keep an eye on how close they are to wearing out.
The pantent involves three components: a sensor for detecting when the shoe wears out; a processor to measure the shoe’s data; and an alarm for alerting the user when a shoe is no longer stable. Similar technology is already being used by major brands like Nike to track athletes’ performances.