Upgraded breathable engineered mesh upper ReactX foam midsole surrounds forefoot and heel Air Zoom units for an energized ride. Signature waffle-inspired rubber outsole for traction and flexibility Plush collar tongue and sockliner for a secure and comfortable fit Responsive cushioning in the Pegasus provides an energized ride for everyday road running. Experience lighter-weight energy return with dual Air Zoom units and a ReactX foam midsole. Plus, improved engineered mesh on the upper decreases weight and increases breathability.