This model seamlessly blends responsive NITRO„¢ foam cushioning with enhanced support from the innovative RUNGUIDE SYSTEM.Dual Density NITRO construction features a soft core for plush cushioning, complemented by a firmer rim that provides crucial support to your stride whenever it´s needed.The TPU Heel Clip adds stability at foot strike, while the wide geometry ensures an exceptionally stable base of support.With a highly cushioned collar and breathable engineered mesh, enjoy unparalleled comfort with every stride.Run forever in FOREVERRUN.Composition:.