The Pegasus 41 features responsive Air Zoom units paired with a React X foam midsole for lightweight energy return. The upper is constructed from engineered mesh for breathability. soft padding soft collar, tongue, and insole responsive cushioning React X foam midsole with Air Zoom units in the forefoot and heel 13% higher energy return than previous React foam waffle-inspired traction classic rubber outsole with waffle tread lightweight engineered mesh upper reflective details