Nike has teamed up with Hyperice, an athletic recovery technology company, to produce this Nike x Hyperice boot. It's not for playing in; it's meant to be worn after a workout in order to speed recovery, or before a game as "pre-covery."

What the boot does is provide both heat and a "dynamic air compression massage" to the wearer's foot and ankles.

"The shoe contains a system of dual-air Normatec bladders bonded to warming elements that evenly distribute heat throughout the entire upper. This combination is designed to drive heat deep into the muscle and tissue in the foot and ankle, helping athletes move, perform and recover naturally much faster. To that end, athlete testers report that their feet and ankles feel freer and lighter — as if they've already completed their warmup before actually starting their usual routine."

"Athletes can synchronize the heat and compression of both shoes with the press of a button, or choose to run the left and right shoes individually — selecting from three distinct levels of compression and heat powered by a battery pack in each shoe's insole."

These are not (yet) commercially available; Nike and Hyperice are testing the boots with the athletes they sponsor. LeBron's reportedly a fan.