The Breakthru 4 has a no-nonsense underfoot feel, built for track day or back day. Its EVERUN? Topsole construction delivers enhanced energy return and continuous cushioning throughout your run, and moulded heel gives extra support and stability. Add to that an engineered mesh upper for a lightweight, dynamic fit, and you'll be ready for anything!Overview?Successor to the Breakthru 3?Newly added EVERUN? Topsole construction for enhanced energy return and continuous cushioning throughout the run?Engineered mesh upper for a lightweight, dynamic fit?Molded heel supportSpecs?Shoe Category: Neutral?Pronation: Neutral?Cushion: Responsive?Construction Type: Neutral?Surface: Road, Track?Arch: High, Normal (Mid)?Water Resistant: No?Waterproof: No?Offset: 8mm?Heel Stack Height: 25mm?Forefoot Stack Height: 17mm?Weight: 7.4 oz. | 210 g.