Changing the midsole composition of a much loved classic can be a big risk, but with the Nike Womens Air Zoom Pegasus 41 GORETEX in BlackSummit WhiteAnthraciteIron Grey updating to ReactX is a no brainer, already proven in other shoes within the range, it offers better performance, with a more environmentally sustainable build. The Nike Pegasus is a daily training classic, and with the new Women's Pegasus 41 GORETEX, Nike have kept the dual Air Zoom build, with one in the heel for your landing, and another in the forefoot for a pop of speed at toe off. Surrounded by updated ReactX, you not only get a foam that is 13% more responsive than its predecessor, but it also reduces it carbon footprint by 43% for a pair of midsoles. The upshot is a springer, more energetic ride that is helping find solutions for our future. The winter tire inspired rubber outsole is designed for wet weather grip and offers a flexible feel to your traction, for a natural gait and confident footing. A GORETEX upper helps keep your feet dry through the worst the weather can throw at them. Heeltotoe drop 10 mm Upgraded ReactX foam midsole With forefoot and heel Air Zoom units Signature waffleinspired rubber outsole for traction and flexibility Plush collar tongue and sockliner for a secure and comfortable fit. Lightweight and breathable design, High quality materials and construction, Very durable, Very practical.