Nike Vaporfly 4 Men's Road Racing Shoes Men to Women Sizing 6 Men = 7.5 Women The Vaporfly 4 is a mile-eating machine that just got lighter. We trimmed weight all over from the previous iteration without sacrificing performance. And the carbon fiber Flyplate and ultra-responsive ZoomX foam midsole combine to give you race-day speed. The result is a more fine-tuned racing shoe that’s trusted from the mile to the marathon.