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 with a carbon fiber Flyplate and ultra-responsive ZoomX foam midsole to give you race-day speed without sacrificing performance. The result is a fine-tuned racing shoe that’s trusted from the mile to the marathon.