Find out what fast feels like in the Saucony Endorphin Speed 5. Designed to help you find your version of fast, the Endorphin Speed 5 combines Saucony's lightweight, responsive cushioning with their rocker SPEEDROLL technology and a nylon plate to propel you forward with confidence. In our Saucony Endorphin Speed 5 review, run tester Kate said "The Speed 5 provides a smooth, buoyant underfoot feel. It makes me feel like I'm floating. Don't be surprised if your running buddies have to tell you to slow down." Details: Upper: The new Hexagon Mesh upper features six-sided perforations for enhanced breathability and a performance-focused feel. A 3D heel counter locks your foot in place for secure, confident runs. Midsole: The refined PWRRUN PB cushioning delivers a firm, controlled ride that's perfect for speed work. It's combined with a full-length nylon plate and SPEEDROLL technology that creates smooth, propulsive transitions.Outsole: Enhanced rubber coverage extends to the heel edge for improved durability, while a new vertical flex groove under the forefoot provides increased flexibility during toe-offs.