The Endorphin Trainer is the first lightweight and fast training shoe from Saucony, designed for everyday training runs and high mileage weeks. It combines innovation and efficiency with a unique feel. The shoe features a top layer of incrediRUN foam for responsiveness and a durable PWRRUN bottom layer for a stable platform. Speedroll technology, enhanced with a ¾ length carbon fiber plate, promotes smoother landings and efficient toe-offs. The XT-900 carbon rubber in high abrasion areas provides grip and durability. The engineered mesh upper offers secure comfort for long distances.