Midsole: It incorporates Nike's lightest and most responsive ZoomX foam, a Pebax-based compound that delivers exceptional energy return. There is a full-length carbon-fiber plate embedded within the midsole, which provides a propulsive, springy sensation to help push the pace.
Upper: The upper is made from a material called VaporWeave (or engineered mesh in newer versions), which is a lightweight, water-resistant, and highly breathable synthetic fabric designed to be soft and conform to the foot.
Design: The shoe features an offset lacing system to reduce pressure on the top of the foot, a wider toe area for a roomier fit, and increased foam underfoot compared to earlier models. The design is focused on minimizing weight while maximizing performance and comfort for distances from 10K to the marathon.