Created for long training runs, the Invincible silhouette includes more foam in the midsole than React foam in the Infinity, creating a soft ride while returning more energy for improved running economy. The rocker geometry and the wider nets in the forefoot help create a more stable ride and fluid stride transition (compared with the more springy transition of plated running footwear), making the Invincible ideal for higher mileage runs. M Nike ZoomX Invincible Run FK