What Our Gearhead(R) Experts Are Saying: "I've logged miles in the Endorphin Speed 5 and love how it blends speed and softness. The PWRRUN PB foam keeps the shoe lively underfoot, and the nylon plate delivers just enough pop without being too stiff. It's fast, light, and surprisingly stable." When we're chasing PRs or knocking out a midweek tempo session, the Saucony Endorphin Speed 5 Running Shoe brings the bounce and efficiency we need to keep pushing forward. It features Saucony's high-performance PWRRUN PB foam for a light, ultra-responsive feel underfoot that keeps every stride energized. The flexible nylon plate adds subtle propulsion without the rigidity of carbon, offering a smoother ride with improved stability and turnover. A consistent 38mm stack height with an 8mm drop keeps the geometry familiar and supportive. Whether we're racing through intervals or logging base miles, this shoe keeps us fast and focused.