The Nike ReactX Pegasus Trail 5 GORE-TEX uses a fully water-proof GORE-TEX upper to help keep you dry no matter the conditions. ReactX has a been developed over a 5-year period and provides a 43% reduction in the carbon footprint of a pair of midsoles, and increases energy return by 13%, giving you improved performance for the planet, and for your runs. The outsole uses a generative traction pattern for excellent grip and runs up over the front of the foot to improve durability.