Saucony Women's ProGrid Hurricane 9 Running Shoe 100% Nylon Stability Dual density SSL EVA midsole maximizes rebound and durability while minimizing wieght Full length progrid with Respon-Tek absorbs impact, dissipates shock and provides a seamless transition from heel through forefoot Medial MCD works with the dual density Impulse EVA to slow the rate of pronation 10.9 oz