Air-filled chambers on the bottom layer compress, then expand, acting like bowstrings and projecting athletes up and forward.

The track’s bottom layer incorporates an array of air-filled cavities that compress as the athlete’s foot impacts the surface, absorbing impact force and vibrations, and converting the maximum amount of kinetic energy into stored energy. As the athlete’s foot leaves the surface, the compressed air causes the cells to spring back to their original shape, acting like bowstrings and projecting the athlete up and forward.