adidas Running - a3 Cushion (White/Dark Navy/Metallic Silver/Toro) - Men's: Lightweight training shoe featuring the a3(R) cushioning system in the heel for a fast, responsive ride. Mesh nylon upper combines lightweight and breathability. Molded EVA insole for anatomical comfort. Heel a3 for optimized energy use throughout foot strike. TORSION(R) system for midfoot integrity.