FDDI - Energy return lies in the design of the shoe. As someone exerts energy, most of that energy is transferred through the shoe and into the ground, and can no longer
Dansko Pace Light Grey Mesh Energy Return Natrual Arch Support Athletic Shoe| Scrubs & Beyond | Scrubs & Beyond
The Science Behind Nike's New ZoomX Vaporfly Next% Marathon Shoe | WIRED
Nike ZoomX. Nike.com
Nike ZoomX Vaporfly NEXT% 2 Women's Road Racing Shoes. Nike.com
Ask the Gear Experts | Running Shoes with High Energy Return