You still need to insert a cable, but this time it's a USB connection to charge the shoe's lithium-polymer battery.

Not surprisingly, this isn't going to be a mass-produced shoe -- in fact, this could make Nike's HyperAdapt seem commonplace. Puma is making just 86 pairs available worldwide on December 13th through its website, Kith and certain retail stores in Berlin, London and Tokyo. Ironically, that rarity could lead to many owners refusing to try the shoe's marquee feature. Why ruin the resale value by actually wearing the shoes?