Rubber sole Rubber sole Shaft measures approximately Ankle Strap from arch Nike sports shoe Lightness and resistance Cushion Nike Free RN 5.0 2021 is the most recent leap forward in the evolution of the free model. Safe lacing is combined with the seamless design for a tight fit. The sole, lighter and closer to the ground, has a new motif with flexion carvings and a modified midsole that offers greater cunning without sacrificing the natural movement of the foot. The new lacing system offers foot stability during the race. The non -elastic material over the whole upper keeps the foot firm in position, while 3 pods in foam in the heel help to feel a greater adherence. The foam in the grove is more rigid, to increase sensitivity than the soil, guaranteeing you sufficient amortization to continue going, kilometer after kilometer. The holes favor the natural movement of the foot, while the double -edged areas at the ends increase their flexibility.