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I love this idea! When I was growing up, my mom would always buy me shoes a lot larger than I needed so I would grow into them since I was growing so fast! These shoes, called Inchworms, have an accordion-like material around the arch of the foot, which can be pulled outward to increase the length of the shoe. All you have to do is press a button, pull, and your shoe can grow up to a full 3 sizes in ½ size increments. That is a lot of savings because shoes can be expensive, even for kids so you get a lot more use out of them! A small counter in the heel even lets you know which size the shoe currently is. For those worried that their child will wear out the shoes long before they outgrow them, the company assures us that they are some of the toughest shoes on the playground. Even better, they are only $39.99 a pair.
Image Source: http://www.ohgizmo.com/2009/04/03/inchworm-shoes-grow-with-your-feet/