The Nike Pegasus 41 features a new full-length ReactX foam midsole and forefoot and heel Air Zoom units. Appearing for the first time in the Pegasus line, ReactX foam provides over 13 percent more energy return compared to React foam while reducing the carbon footprint in a pair of midsoles by at least 43 percent. Combined with Nike Air Zoom, the Pegasus 41 provides the responsive, cushioned ride that runners love from the Pegasus line.