Nike has opened a window onto the field testing behind its Apex racing shoe and the prototypes it is developing for elite marathoners. In a new account from Eldoret, Kenya, the company describes runners trying different constructions, reporting how each one feels, and taking those notes back to the product team. The work took place in July at the Lornah Kiplagat Sports Academy with athletes including Jacob Kiplimo, Brigid Kosgei and Eliud Kipchoge.
The differences are measured in details a race can expose. Kiplimo had reported his foot moving inside a previous shoe on corners, prompting Nike to work on lockdown and weight. Kosgei compared prototypes for fit, stability and grip on wet pavement. The next morning, both tested several configurations in repeated track intervals, with the team listening between efforts.
The public-facing Apex has its own distinct specification. Nike says the shoe pairs double-stacked Air Zoom units with ZoomX LT foam, a carbon-fibre Flyplate and a Flyknit X upper. Its zero-drop platform measures 40 millimetres at the heel and forefoot. Nike plans to release Apex in January 2027 through its website and select retailers. Nike reports up to 40% more energy return than Alphafly 3 in a men's size 9.
The Eldoret sessions show why the next race shoe is not settled by one lab number. Cushioning, weight and stability have to survive real turns, varied surfaces and the preferences of different runners. Nike is making that exchange visible as technical race footwear becomes both a performance contest and a story about the athletes who shape the product.
