Nike Vaporfly trainers worn by Eliud Kipchoge and Brigid Kosgei are form of 'technical doping' | Sport | The Times
By Wearing Vaporfly Prototypes, Eliud Kipchoge, Galen Rupp, & Shalane Flanagan Are All Guilty of Mechanical Doping in 2016 - Will Anything Be Done About It? - LetsRun.com
4 Things to Know about Nike's Vaporfly Shoes | Watch Athletics
Eliud Kipchoge's sub 2 hour marathon shoes
Nike Vaporfly ban: why World Athletics had to act against the high-tech shoes