"Dubbed Ekto One, the boots are the first product to come out of a Pittsburgh-based startup called Ekto VR. They’re made of lightweight carbon fiber and are sort of like a pair of skates with automatically-engaging brakes. They’re a bit clunky, because they have to accommodate the rotating discs built into the bottom, which turn in the direction the wearer moves. They’re basically little treadmills in boot form; your foot touches the floor and a set of wheels pull your leg back while you walk forwards, matching the motion it looks like you’re taking in your headset."
https://singularityhub.com/2020/10/02/these-robotic-virtual-reality-boots-make-it-feel-like-youre-walking-while-you-stay-in-place/
https://singularityhub.com/2020/10/02/these-robotic-virtual-reality-boots-make-it-feel-like-youre-walking-while-you-stay-in-place/