The Endorphin Racer 2 is light on weight and heavy on tech. Our lightest road racer features a single layer mesh upper for breathability, FLEXFILM overlays for support without adding weight, and a new EVERUN forefoot midsole provides more energy return with every step.OVERVIEW?Successor to the Endorphin Racer?FLEXFILM upper is lightweight and supportive?Single layer mesh cuts down on weight, while boosting breathability?EVERUN forefoot midsole provides more energy return with every step?SSL EVA molded heel midsole for lightweight support?PWRTRAC Rubber outsole provides 3x better traction than standard rubberSPECS?Surface: Road, Track?Offset: 0mm?Heel Stack Height: 10mm?Forefoot Stack Height: 10mm?Weight: 4.0 oz. | 115 g.