What is the small sponge cushion in Adidas mi-coach shoes for?

Mi-coach shoes support data recording function, but the shoes themselves do not have a mi-coach chip. The small groove under the small sponge pad on the sole allows you to place the chip according to your choice. The chip needs to be purchased separately. Only high-end shoes have it. It is a smart chip that is placed on the sole of the shoe to record heart rate, distance traveled, calories burned, etc.

It’s very frustrating to buy a good horse without a good saddle, and it won’t be able to perform at its best~Good luck~