Faster, made easier. The Saucony Endorphin Speed utilizes all new technology that Saucony has been cooking up in the kitchen for some years now and now presented in a lightweight training and racing companion. First, an ultra-lightweight PeBax-based PWRRUN PB foam gives you the bounce you've been craving without the weight - and plenty of it. Second, a forward rocking geometry, SPEEDROLL, gives you that quick transition and springy toe-off creating a propulsive feeling with each step. Third, sandwiched between layers of PWRRUN PB foam is a responsive nylon plate for more efficient and effective power transfer, helping to give the runner back as much energy as possible. Whether you're going for daily runs, faster tempos or races of any distance, the Endorphin Speed is the one for you!