Basically, Nike React is instant go - a contagious sensation that makes you want to run. Our running shoes with Nike React bring more bounce to your run and make running more fun. You can also find Nike React in basketball shoes. And you can learn more about Nike React at nike.com/react.

Running in a high-efficiency shoe like the Vaporfly means less wear and tear on the body, helping you perform your best during key workouts. You'll still need an adequate recovery shoe in your rotation, but we strongly recommend lacing up your Vaporflys for speed workouts and tempo runs to reap major training benefits.

First, runners' ankle mechanics improve. This is likely thanks to the curved carbon-fiber plate that runs throughout the midsole from heel to toe; the researchers believe that the plate, in a sense, stabilizes your ankle and reduces your “rotational force” - or the work your calves would normally have to do.

Vaporfly Mode It actually feels like you're cheating when you run in them because of that plate. For that reason, these sneakers actually should be worn for everyday use and walking.

The Next% 3 is still that versatile racing shoe that can go from 5k to marathon. Andrea: The new Vaporfly 3 is the best version yet of Nike's flagship super shoe. It is for runners who want an extremely responsive racing shoe that does not feel like a marshmallow.

(The last thing you want to be doing is lugging around heavy shoes on race day.) The newest Vaporfly has an upper that's nearly see-through, so this pair won't get soggy in the rain either.

Every version of the Vaporfly has had a full-length carbon plate sandwiched by a chunky stack of Nike's ZoomX foam. This is a PEBA-based foam that is lightweight, and exceptionally soft and bouncy. When combined with the plate it produces a propulsive-yet-comfortable ride that's great for road races.

The 4% in the original Vaporfly's name represented how much the shoe improved running economy according to Nike's testing. It's a claim backed by independent research, as well as millions of runners, though how much the shoe improves your economy varies between individuals.