![Feb 29, 2020; Atlanta, Georgia, USA; Detailed view of the Nike alphafly shoes worn by winner Galen Rupp (right) and Nike vaporfly shoes worn by third-place finisher Abdi Abdirahman during the US Feb 29, 2020; Atlanta, Georgia, USA; Detailed view of the Nike alphafly shoes worn by winner Galen Rupp (right) and Nike vaporfly shoes worn by third-place finisher Abdi Abdirahman during the US](https://c8.alamy.com/comp/2EJPFYB/feb-29-2020-atlanta-georgia-usa-detailed-view-of-the-nike-alphafly-shoes-worn-by-winner-galen-rupp-right-and-nike-vaporfly-shoes-worn-by-third-place-finisher-abdi-abdirahman-during-the-us-olympic-team-trials-marathon-mandatory-credit-kirby-leeusa-today-sportssipa-usa-2EJPFYB.jpg)
Feb 29, 2020; Atlanta, Georgia, USA; Detailed view of the Nike alphafly shoes worn by winner Galen Rupp (right) and Nike vaporfly shoes worn by third-place finisher Abdi Abdirahman during the US
![Alberto Stretti on Twitter: "Galen Rupp ran 10000m without normal spikes- shoes...to be relaxed for marathon?? ...interesting techincal argument https://t.co/nw3CtFpIA4" / Twitter Alberto Stretti on Twitter: "Galen Rupp ran 10000m without normal spikes- shoes...to be relaxed for marathon?? ...interesting techincal argument https://t.co/nw3CtFpIA4" / Twitter](https://pbs.twimg.com/media/CqIpSxOWEAAkeYt.jpg)
Alberto Stretti on Twitter: "Galen Rupp ran 10000m without normal spikes- shoes...to be relaxed for marathon?? ...interesting techincal argument https://t.co/nw3CtFpIA4" / Twitter
![IAAF steps up investigation into fears over springs in Nike running shoes | Athletics | The Guardian IAAF steps up investigation into fears over springs in Nike running shoes | Athletics | The Guardian](https://i.guim.co.uk/img/media/f5670c6db81bb06a5192775ad68df5503dafde3e/1191_273_2309_1386/500.jpg?quality=85&auto=format&fit=max&s=276ab9433541144885ff39ff2a752bd9)