adidas Running - a3 MegaRide W (White/Metallic Silver/Vivid Green/Pearlized White) - Women's: With the revolutionary a3 structured cushioning system, the MegaRide has a smooth, dynamic ride that gives you the feeling of being propelled through every footstrike. Above and beyond all that, it just looks all cool and space age. Full-length structured a3 gives you a propulsive, yet stable ride. Breathable open mesh upper with synthetic trims for durability and reflective accents. Full-length a3 TPU plate midsole for dynamic cushioning. adiPRENE + in the forefoot maintains propulsion and efficiency. Carbon rubber outsole with flex grooves provides a combination of durability and flexibility. Shoe weighs 13.5 oz.