Only an annecdote, but its mentioned here: https://www.theguardian.com/sport/2024/apr/07/carbon-fibre-super-shoe-running-marathon-vaporfly-adziero-tracksmith h

Only an annecdote, but its mentioned here: https://www.theguardian.com/sport/2024/apr/07/carbon-fibre-super-shoe-running-marathon-vaporfly-adziero-tracksmith https://www.theguardian.com/sport/2024/apr/07/carbon-fibre-s...