I don't like Cricket wrote:
do your researchh wrote:
It's not the foam, it's THE CARBON FIBRE PROSTHETIC LIMB that is hidden inside the shoe that works like Oscar Pistorious's legs except on a smaller scale.
Nicely put. Not sure if everyone on here make daft comments re the foam being some sort of Mac & Jack's Wonder Potion really understand that there's such a solid, rigid material in there - literally a hidden spring.
You don't seem to understand that literally every cushioned shoe is a spring. The difference between an EVA foam racing flat and a pogo stick is a difference of degree, not of kind. Some springs are better than others. The VF is the best spring ever made because it is very compliant and because it returns more energy than any previous spring. This has literally been measured. The VF returns 87%, vs. 75.9% for the Adios Boost. The fact that the VF also compresses so much means that not only is it efficient at storing energy, but the quantity of energy it stores is almost twice as much as the Boost. Those are the characteristics that determine how much the shoe helps you, not whether the shoe happens to achieve such performance through the use of one technology vs. another. A Nike air chamber bounces, just like a basketball bounces. A Spira spring bounces, just like pogo-stick bounces. But both are garbage in racing flats. Seriously--have you ever run in Spiras? There's no debate that those are literal springs. The reason they aren't banned is because people who actually understood something about shoes realized there was no principled distinction between shoes "with springs" and shoes that "are springs," i.e., every shoe.