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What Our Gearhead(R) Experts Are Saying:"The Endorphin Trainer blends the efficiency of a race shoe with the durability of a daily trainer. The Speedroll technology and carbon fiber plate give me a smooth, responsive toe-off, while the cushioned midsole keeps my feet comfortable through high-mileage weeks."For runners who demand innovation and durability, the Endorphin Trainer is the ultimate daily companion. Combining the lightweight responsiveness of incrediRUN foam with the structured support of PWRRUN, this shoe provides unmatched efficiency on long-distance training runs. The Speedroll technology is fine-tuned for smoother landings and energized toe-offs, thanks to a 3/4-length carbon fiber plate. With XT-900 carbon rubber strategically placed for traction and durability, the Endorphin Trainer is built to endure high mileage while maintaining the feel of a premium, fast shoe.