Double Down On Race Day With The Fast-R Nitro Elite. A Cutting-Edge, Two-Part Midsole Features Best-In-Class Nitro Elite For Supreme Responsiveness And Innovative Pwrplate Technology To Ensure Maximum Running Efficiency And Stability. The Marathon-Worthy Racing Shoe Offers A Sock-Like Fit In Breathable Monomesh, With Targeted Pwrtape Reinforcement For Added Durability And Support. The Cushioned Heel Works With A Reactive Forefoot For Peak Propulsion, While Pumagrip Provides Multi-Surface Traction Without Added Bulk. Travel At The Speed Of Lightweight.