The ZoomX VaporFly NEXT% 'Sail' is outfitted in an understated color scheme that allows the running shoe’s performance benefits to take the spotlight. They include an upper made with Vaporweave . an airy material that’s lighter than Flyknit . and a full-length curved carbon fiber plate embedded in the Nike ZoomX foam midsole . scientifically proven to generate enhanced energy through rigorous testing at Nike’s Sport Research Lab.