The personal relationship you have with the Peg is unlike anything else. Faithful. Reliable. The pair that’s always there, pushing the running world forward, while still putting your wants and needs first. Hello, ReactX Nike ReactX is a lightweight, durable foam that delivers a smooth, responsive ride—with much less impact. Providing 13% more energy return and 43% less carbon impact than regular React foam—ReactX makes this Pegasus unlike any before with less impact from heel to toe to earth. The extra room provides a stable, springy Zoom Air engine for that extra horsepower when you need it. Light and Breathable The upper is made of an engineered mesh that’s even lighter and more breathable than the Peg 40 to create an inviting feel and fit. The inner confines of the shoe are comfortable, breathable and forgiving in the toes, arch and heel, where your feet are most sensitive. Hugs The Foot Built with the same internal materials and padding as its predecessor, the Pegasus 41 will hug your foot with an implemented midfoot band for a more secure but forgiving sensation. The midfoot strap for a more molded fit to the foot, shaped for all sized arches.