Product Storythe Lightweight Running Shoe That Will Do It All, No Matter The Terrain– The Fast-Trac Nitro 2 Has Dropped. It Delivers A Smooth Ride And Ground-Feel On Surfaces Including Including Loose Trails And Gravel, Thanks To A Full-Length Nitrogen-Infused Top Layer Embedded In The Profoamlite Midsole. Add To That The Durable Pumagrip-Atr Outsole And Integrated Eyestays For A Snug Fit, Along With Details At The Toe That Help Drain And Protect From Debris – And You're Golden With This Ground-Breaking Shoe Made For All Runners In All Four Seasons.features & Benefitsnitro : Enclosed Nitrogen-Injected Foam Designed To Provide Responsiveness And Cushioning In A Lightweight Packageprofoamlite: Extremely Lightweight Eva Designed To Cushion Your Landing And Propel Each Steppumagrip Atr: Trail-Ready Performance Rubber Compound Designed For Traction On Ice, Mud, And Unstable Surfacesdetailsripstop Mesh Upperforefoot Drainage Ports And Debris Protectorscushioning Level: Mediumpuma Formstrip On The Lateral Sideheel-To-Toe Drop: 6Mmshoe Pronation: Neutral