Style#: HQ2593-001 Stretchy circular-knit and breathable mesh on upper Full-length, superlight ZoomX foam provides springy cushioning. Full-length Air Zoom unit helps propel you forward like never before. ReactX foam midsole is 13% more responsive than previous React technology. The Pegasus Premium supercharges responsive cushioning with a triple stack of our most powerful running technologies: ZoomX foam, a sculpted Air Zoom unit and ReactX foam. It’s the most responsive Pegasus ever, providing high energy return unlike any other. With a lighter-than-air upper, it decreases weight and increases breathability so you can fly faster.