Boost is a lightweight midsole composed of TPU pellets, delivering a soft and responsive ride.Dual Density Boost on the medial side provides a more natural-feeling supportive ride to deliver adidas' "Energized Stability."Torsion System uses a thermoplastic unit in the midfoot that allows the forefoot and rearfoot to move independently for increased stability. A responsive ride with a hint of support, the adidas adizero Tempo 9 is best suited for tempo runs, but has sufficient cushioning for daily runs as well.Available July, 2017.