Speed, performance and comfort combine in the Endorphin Speed 4, designed to get you over the finish line faster than ever before.

• Smooth SPEEDROLL technology for effortless speed, smooth turnover and propulsive forward motion.
• PWRRUN PB foam is a true unicorn, offering the best combination of cushioning and energy return of any foam on the market.
• Re-engineered winged nylon plate provides reinforcement while maintaining flexibility.