The responsive cushioning of the Pegasus provides an energized ride for everyday road running. Experience a lighter energy return with two Air Zoom units and a ReactX foam midsole. The improved mesh fabric in the upper reduces weight and increases breathability. The ReactX foam midsole surrounds the Air Zoom units in the forefoot and heel for a dynamic ride. The signature waffle-inspired rubber outsole provides traction and flexibility. What's new? The all-new ReactX foam midsole is 13% more responsive than the previous React technology. ReactX foam has been designed with performance and the environment in mind to reduce the carbon footprint in a pair of midsoles by at least 43% by using less energy in production than the previous React foam.