The Foreverrun Nitro Dawns A New Era Of Support And Guidance For All Runners, Providing The Softness Of A Full Nitro Midsole Without Compromising Stability. It Features A Newly Developed Nitro Midsole With Two Different Densities – A Softer Core With A Firmer Rim – And An Asymmetrical Heel Counter To Hold The Foot In Place Through Every Stride. The Theme Also Continues On The Outsole, Thanks To A Wider Medial Rubber Segment Stabilizing Late-Stage Pronation. In Short, It's The Perfect Blend Of Support And Cushion.