As flying cars and Hoverboards have shown, it's not easy to bring the technologies found in Back to the Future Part II to life. This Nike Hyperadapt Teardown takes a look at how the auto-lacing system from the film was recreated. Hidden inside the shoe are sensors to let it know when you've it put on and buttons to let you adjust the fit. Heavy duty motors attached to Flywire pull the laces tight, arrays of LEDs provide lighting effects, wireless charging eliminates the need for battery changes, and an ARM Cortex M4 processor runs the show. It's like having a motor-laden smartphone hidden inside each shoe.