Double Down On Race Day With The Fast-R Nitro Elite. The Cutting-Edge, Two-Part Midsole Features Nitro Elite Foam For Supreme Responsiveness And Pwrplate Technology To Ensure Maximum Running Efficiency And Stability. The Marathon-Worthy Racing Shoe Offers A Sock-Like Fit With A Breathable Engineered Mesh Upper And 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. This Version Has A Unique Colourway In Celebration Of Our 75Th Anniversary.