Dustin Joubert on Instagram: “Advancements in running shoe technology, particularly in the Nike Vaporfly line, have been shown to improve running economy/performance…”
![Longitudinal bending stiffness does not affect running economy in Nike Vaporfly Shoes - ScienceDirect Longitudinal bending stiffness does not affect running economy in Nike Vaporfly Shoes - ScienceDirect](https://ars.els-cdn.com/content/image/1-s2.0-S2095254621000739-ga1.jpg)
Longitudinal bending stiffness does not affect running economy in Nike Vaporfly Shoes - ScienceDirect
Dustin Joubert on Instagram: “Running Economy in Alphafly 4% better than Streakfly for me. Was it ever really a question though? Race your 5k/10k in your most economical…”
![Metabolic and performance responses of male runners wearing 3 types of footwear: Nike Vaporfly 4%, Saucony Endorphin racing flats, and their own shoes - ScienceDirect Metabolic and performance responses of male runners wearing 3 types of footwear: Nike Vaporfly 4%, Saucony Endorphin racing flats, and their own shoes - ScienceDirect](https://ars.els-cdn.com/content/image/1-s2.0-S2095254620301630-ga1.jpg)
Metabolic and performance responses of male runners wearing 3 types of footwear: Nike Vaporfly 4%, Saucony Endorphin racing flats, and their own shoes - ScienceDirect
![Controversial Nike Vaporflys to escape ban but running shoe rules will tighten | Athletics | The Guardian Controversial Nike Vaporflys to escape ban but running shoe rules will tighten | Athletics | The Guardian](https://i.guim.co.uk/img/media/f5670c6db81bb06a5192775ad68df5503dafde3e/1191_273_2309_1386/master/2309.jpg?width=1200&height=1200&quality=85&auto=format&fit=crop&s=f0a9eb842cad09baac87d9c701bd3b0f)