New Balance’s Latest Shoes Come With 3D-Printed Soles

If you currently own a pair of running shoes, the odds are that the midsole—the shock-absorbing layer in between the inner and outer soles—is made from molded ethylene vinyl acetate (EVA), which is squishy, resilient foam. As a cushioning material, EVA foam isn’t bad. It’s elastic, affordable, and can be dyed a variety of colors. …

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