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Kyle Barnes, an exercise science assistant professor at Grand Valley State University in Michigan, conducted a study around two years ago that compared the Vaporfly shoes to Nike’s Zoom Matumbo 3 (a track spike) and Adidas Adizero Adios 3. 29, meaning it meets a new rule that shoes must be available on the open market by April 30 to be allowed at the Tokyo Games. The Alphafly will be available for sale to Nike members starting Feb. Both the Vaporfly and the Alphafly meet a World Athletic rule that limits the sole thickness to no more than 40 millimeters. The Air Zoom Alphafly Next% steps it up a notch with two “air pods" in the sole for extra cushioning.
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Independent and company-sponsored studies have found that the shoe gives runners a 4% edge in energy efficiency.
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The shoe also has a carbon-fiber plate that acts like a lever to reduce the work at the ankle. What differentiates the Vaporfly is a foam midsole that is lighter and less dense than others, allowing for extra cushioning without adding weight. “It’s definitely not a level playing field when those who can afford the shoes have that type of advantage." “I’d like to think that it was because of all of my training for the London Marathon but I do think the shoes had something to do with my performance,” Lam said. He ran the marathon in 2:59.30, seven minutes faster than his previous personal best, a result he called “insane.” It helped him achieve his lifelong goal of qualifying for the Boston Marathon this year. said he spent $400 for a pair of StockX ahead of the London Marathon last spring because the version he wanted was sold out elsewhere. Many marathoners are gladly paying the $250 price tag on Nike’s website - and sometimes more - even as they wonder how much credit they can personally take for improved results.īryan Lam, an amateur marathoner in Washington, D.C. Vaporfly shoes have become a common sight at marathons all over, easily spotted with their neon green or pink hue.