Inspired by the Vaporfly, the Nike Zoom Fly 4 gives distance runners race-day comfort and durability. City-light-inspired details and the power of a carbon-fibre plate keep you in the running mile after mile. Complete Cushioning A full-length Nike React midsole balances cushioning and responsiveness with lightweight, durable foam that delivers an extremely smooth ride. The Look and Feel of Fast A lightweight upper evokes the look of fast, while the inner sleeve and a low collar contour to your foot in a racing fit. Propulsive Feel A carbon-fibre plate inside the midsole can shrink or expand the amount of fibre layers for optimal flexibility in your stride.