The Pegasus 41 features the energetic Zoom Air cushioning complemented by softer, more responsive ReactX foam. Nike ReactX technology is made from lightweight, durable foam for a smooth, responsive ride. And what makes it truly extraordinary: it promotes sustainability. The interior of the shoe is comfortable, breathable and flexible in the toe, arch and heel area where the foot is most sensitive. The Velcro fastener in the middle adapts to the shape of the foot and adapts to all types of arches.