Inspire and electrify on every run with the Endorphin Pro 3. With its SPEEDROLL Technology signature carbon-fiber plate and an even thickerstack of PWRRUN PB foam (39.5 mm), you get more cushion and pop underfoot for the ultimate go-fast experience. Meets World Athletics guidelines. Run SMALL! Bought from Relay shoes but too small for me. Never used. Retails on Amazon for $139.95