It's been invented to help out runners looking for that little bit extra when they race, because the lighter the shoe, the less effort is needed.

The shoes are also the first pair to be recyclable when they're worn out, with Nike asking people to send them back when they're finished with.

Cheaper than normal trainers

Then the company will grind down the soles of the trainers, called the Mayfly, and use the bits to make things like basketball courts and running tracks.