The GEL-DS SKY SPEED is a lightweight training shoe designed for neutral runners. The outsole features a Guidance Line to improve running efficiency, as well as Propulsion Trusstic, which extends into the forefoot and allows for increased power at propulsion. Along with its Asymmetrical Lacing Design, the new Discrete Eyeletstay improves fit by allowing each eyelet to pull directly from the base of the shoe. The women's version features Gender Specific Space Trusstic.