“We’re interested in something many people call advanced footwear technology. That’s essentially a shoe that incorporates a midsole that is highly compliant but also resilient, so it’s able to rebound and return nearly as much energy as it has absorbed. In addition to the midsole foam, it also includes a …

“The biggest thing I learned here is that not every shoe works for everybody. We have elite athletes who prefer our more entry-level or mid-range models, and sometimes entry-level runners have much better performances in our elite-level shoes.”